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136The ocean floor is covered by an average of 0.5 km of sediment, which consist of rock particles and organic remains. Clay minerals, which are formed by the weathering of continental rocks and carried out to sea by rivers and wind, are usually abundant in the deep sea. Thick deposits of such detrital material are often found near mouths of rivers and on continental shelves; fine particles of clay are spread through the ocean and accumulate slowly on the deep-ocean floor. These sediments are stirred up and periodically redistributed by fierce current-generated disturbances that are called benthic storms because they occur in the sparsely populated deep-sea habitat known as the benthic zone. Also accumulating as sediment in the benthic zone are the calcium carbonate shells of small organisms such as foraminifera and the siliceous shells of marine protozoans. o sediment 5sedEmEnt n. 沉积物 o organic remains C:5Anik ri5meinsn. 有机残留物 o clay mineral klei 5minErEln. 粘土矿物 o weathering 5weTEriN n. 侵蚀 o carried out 5kArid autv. 传送 o abundant E5bQndEnt adj. 丰富的 o deposit di5pCzEt n. 沉淀物 o detrital di5traitEl adj. 由岩屑形成的 o mouth of river mauW Ev 5rivEn. 入海口 o accumulate E5kju:mjuleit v. 堆积 o stir up stE: Qpv. 搅动 o fierce fiEs adj. 猛烈的 o disturbance dis5tE:bEns n. 局部运动 o benthic storm 5benWik stC:m n. 深海风暴 o sparsely spB:sli adv. 稀少地 o habitat 5hAbEtAt n. 栖息地 o benthic zone 5benWik zEun n. 深海区域 o calcium carbonate 5kAlsiEm 5kB:bEneit n. 碳酸钙 o foraminifera fE7ramE5nifErE n. 有孔虫类 o siliceous sE5liFEs adj. 由硅石组成的 o protozoan 7prEutEu5zEuEn n. 原生动物 137The surface currents of the ocean are characterized by large gyres, or currents that are kept in motion by prevailing winds, but the direction of which is altered by the rotation of the earth. Although the surface circulation of the ocean is a function of winds and the rotation of the earth, the deeper circulation in the oceans is a function of density differences between adjacent water masses.o current 5kErEnt n. 水流 o gyre 5dVaiE n. 漩涡 o motion 5mEuFEn n. 运动 o rotation rEu5teiFEn n. 自转 o circulation 7sE:kju5leiFEn n. 循环 o density 5densiti n. 比重 o adjacent E5dVeisEnt adj. 紧挨着的 138All volcanoes are formed by the accumulation of magma(molten rock that forms below the earths surface). Magma can erupt through one or more volcanic vents, which can be a single opening, a cluster of openings, or a long crack, called a fissure vent. It forms deep within the earth, generally within the upper part of the mantle, or less commonly, within the base of the earths crust. Some lava(molten rock that erupts at the earths surface) can be as thick and viscous as toothpaste, while other lava can be as thin and fluid as warm syrup and flow rapidly down the sides of a volcano. Once lava hardens it forms igneous rock. After many eruptions, the volcanic materials pile up around the vent or vents. These piles form a topographic feature, such as a hill, mountain, plateau, or crater, that we recognize as a volcano.o volcano vCl5keinEu n. 火山 o accumulation Ekju:mju5leiFEn n. 堆积物 o magma 5mAmE n. 岩浆 o molten 5mEultEn adj. 熔化的 o erupt i5rQpt v. 喷出 o volcanic vent vCl5kAnik ventn. 火山口 o vent vent n. 孔,口,裂口 o cluster 5klQstE n. 串 o a cluster of ei 5klQstE Evadj. 成群的,成串的 o crack krAk n. 断裂处 o fissure vent5fiFE vent n. 断裂口 o fissure 5fiFE n. 裂缝;裂隙 o mantle 5mAntl n. 地幔 o crust krQst n. 地壳 o lava 5lB:vE n. 熔岩 o thick Wik adj. 厚的 o viscous 5viskEs adj. 粘性的 o toothpaste 5tu:Wpeist n. 牙膏 o thin Win adj. 薄的 o fluid 5flu:id adj. 易流动的 o syrup 5sErEp n. 糖浆 o harden 5hB:dn v. 变硬,凝固 o igneous rock 5iniEs rCk n. 火成岩 o pile up pail Qpv. 堆积 o pile pail n. 堆积,堆 o topographic 7tCpE5rAfik adj. 地形学上的 o plateau plA5tEu n. 高地 o crater 5kreitE n. 坑,火山喷火口; (月球上的)环形山 o recognize 5rekinaiz v. 识别 139Sedimentary rocks are classified according to their manner of origin into mechanical or chemical sedimentary rocks. Mechanical rocks, or fragmental rocks, are composed of mineral particles produced by the mechanical disintegration of other rocks and transported, without chemical deterioration, by flowing water. They are carried into larger bodies of water, where they are deposited in layers. Shale and sandstone are common sedimentary rocks of mechanical origin.o sedimentary rock sedE5mentEri n. 沉积岩 o manner 5mAnE n. 样式 o fragmental frA5mentEl adj. 碎屑状的 o mineral 5minErEl n. 矿物,矿石 o particle 5pB:tikl n. 颗粒 o disintegration dis7intE5reiFEn n. 分裂,崩解 o deterioration di7tiEriE5reiFEn n. 磨损,腐化,变质 o deposit di5pazEt v. 沉积,沉淀 o layer 5leiE n. 地层 o shale Feil n. 页岩 o sandstone 5sAndstEun n. 砂岩 140The materials making up chemical sedimentary rocks may consist of the remains of microscopic marine organisms precipitated on the ocean floor, as in the case of limestone. They may also have been dissolved in water circulating through the parent rock formation and then deposited in a sea or lake by precipitation from the solution. Halite, gypsum are formed by the evaporation of salt solutions and the consequent precipitation of the salts.o make up meik Qpv. 组成 o consist of kEn5sist Evv. 由组成 o microscopic organism maikrE5skapik 5C:EnizEmn. 微生物 o marine mE5ri:n adj. 海洋的 o precipitate pri5sipEteit v. 沉淀 o in the case of in TE keis Evadv. 在的情况下 o limestone 5laimstEun n. 石灰石 o dissolve di5zClv v. 溶解 o circulate 5sE:kjuleit v. 循环 o solution sE5lu:FEn n. 溶液 o halite 5hAlait n. 岩盐 o gypsum 5dVipsEm n. 石膏 o evaporation i7vApE5reiFEn n. 蒸发(作用) o salt solutionsC:l?sE5lu:FE? n.盐溶液 141Most shales(common name applied to fine-grained varieties of sedimentary rock formed by the consolidation of beds of clay or mud)exhibit fine laminations that are parallel to the bedding plane and along which the rock breaks in an irregular, curving fracture. Most varieties of shale are colored in various shades of gray, but other colors, such as red, pink, green, brown, and black, are often present. Shales are soft enough to be scratched with a knife and feel smooth and almost greasy to the touch. Many shales yield oil when distilled by heat, and the sedimentary rocks containing larger quantities of oil are called oil shales. Widely distributed throughout the world, oil shales are a source of oil for countries lacking petroleum.o shale Feil n. 页岩 o fine-grained 5fain5reind adj. 纹理细腻、平整的 o consolidation kEn7sClE5deiFEn n. 加固 o clay klei n. 粘土 o exhibit i5zibEt v. 显示、显出 o lamination 7lAmE5neiFEn n. 层叠结构 o parallel to 5pArElel tu:adj. 与.平行/相似的 o bedding plane 5bediN plein n. (岩层)层平面, 底层 o curving 5kE:viN adj. 弯曲的 o fracture 5frAktFE n. 岩石的裂缝或断层 o shades of gray Feidz Ev rein. 灰度梯度(深浅不同的各种灰色) o pink piNk n. 粉红色 o scratch skrAtF v. 刮擦 o greasy 5ri:si adj. 油腻的 o yield ji:ld v. 生出, 出产; 产生 o distill di5stil v. 蒸馏 o oil shale Cil Feiln. 油母页岩 o distribute dis5tribju:t v. 分布,散布(over) o petroleum pE5trEuliEm n. 石油 142All limestone forms from the precipitation of calcium carbonate from water. Calcium carbonate leaves solutions in many ways and each way produces a different kind of limestone. When a drop of dilute hydrochloric acid is placed on a piece of limestone, the acid reacts with the calcite and forms bubbles of carbon dioxide. This “fizz” reaction is so characteristic of limestone that many geologists carry a small bottle of dilute hydrochloric acid into the field for a rapid and easy identification of limestone.o limestone 5laimstEun n. 石灰石 o precipitation pri7sipE5teiFEn n. 沉淀 o calcium carbonate 5kAlsiEm sE5lu:FEnn. 碳酸钙 o solution sE5lu:FEn n. 溶液 o dilute dai5lu:t adj. 稀释的 o hydrochloric acid 7haidrEu5klC:rik 5AsEdn. 盐酸 o acid 5AsEd n. 酸 o calcite 5kAlsait n. 方解石 o bubble 5bQbl n. 气泡 o carbon dioxide 5kB:bEn dai5Cksaidn. 二氧化碳 o fizz fiz n. 嘶嘶声 o geologist dVi5ClEdVist n. 地质学家 o field fi:ld n. 野外 o identification ai7dentEfE5keiFEn n. 鉴定 143The point within the Earth along the rupturing geological fault where an earthquake originates is called the focus, or hypocenter. Seismologists know from observations that most earthquakes originate as shallow-focus earthquakes and most of them occur near plate boundaries areas where the Earths crustal plates move against each other.o rupturing 5rQptFEriN adj. 断裂的 o fault fC:lt n. 断层 o focus 5fEukEs n. 震源(“震中”是epicenter) o hypocenter 5haIpEJ9sentE(r) n. 震源 o s eismologist saiz5malEdVist n. 地震学家 o boundary 5baundEri n. 边界 o crustal 5krQstEl adj. 地壳的 144The destruction an earthquake causes depends on its magnitude and duration, or the amount of shaking that occurs. A structures design and the materials used in its construction also affect the amount of damage the structure incurs. Earthquakes vary from small, imperceptible shaking to large shocks felt over thousands of kilometers. Earthquakes can deform the ground, make buildings and other structures collapse, and create tsunamis.o magnitude 5mAnEtu:d n. 震级 o duration du5reiFEn n. 持续时间 o shaking 5FeikiN n. 摇晃 o incur in5kE: v. 招致 o vary 5veEri v. 不同,变化 o imperceptible 7impE5septEbl adj. 极细微的 o deform di5fC:m v. (使)变形 o collapse kE5lAps n. 倒塌 o tsunami su:5nB:mi n. 海啸145The sudden movement of rocks along a fault causes vibrations that transmit energy through the Earth in the form of waves, called body waves, and there are two types of body waves: primary, or P, waves, and secondary, or S, waves. Body waves, or P and S waves, radiate out from the rupturing fault starting at the focus of the earthquake. P waves are compression waves because the rocky material in their path moves back and forth in the same direction as the wave travels alternately compressing and expanding the rock. P waves are the fastest seismic waves; they travel in strong rock at about 6 to 7 km per second. P waves are followed by S waves, which shear, or twist, rather than compress the rock they travel through. S waves travel at about 3.5 km per second. S waves cause rocky material to move either side to side or up and down perpendicular to the direction the waves are traveling, thus shearing the rocks. Both P and S waves help seismologists to locate the focus and epicenter of an earthquake.o vibration vai5breiFEn n. 振动 o transmit trAnz5mit n. 传送 o primary 5praimEri adj. 初级的 o secondary 5sekEndEri adj. 第二等级的 o primary wave 5praimEri weiv n. 纵波 o secondary wave 5sekEndEri weivn. 横波 o radiate 5reidieit v. 散发 o compression kEm5preFEn n. 压缩 o back and forth bAk And fC:Wadv. 来回地 o alternate C:l5tE:nit adj. 交替的 o seismic wave5saizmik weiv n. 地震波 o shear FiE v. 剪切 o twist twist n. 扭曲 o side to side said tu: saidadv. 从一边到另一边 o up and down Qp And daunadv. 上下 o perpendicular 7pE:pEn5dikjulE adj. 垂直的 o epicenter 5episentE n. 震中 146Glacier, an enduring accumulation of ice, snow, water, rock, and sediment that moves under the influence of gravity, is an intriguing part of Earths natural environment and their majestic beauty in wild and inaccessible mountain settings is unparalleled.o glacier 5leiFE n. 冰川 o accumulation Ekju:mju5leiFEn n. 堆积物 o sediment 5sedEmEnt n. 沉积物 o gravity 5rAvEti n. 重力 o intriguing in5tri:iN adj. 引人入胜 o majestic mE5dVestik adj. 雄伟的 o inaccessible 7inik5sesEbl adj. 难以接近 o unparalleled Qn5pArEleld adj. 无可比拟的147Ice sheets are the largest ice masses found on Earth, covering huge land areas. The ice sheet in Antarctica covers 13 million sq km. It is over 4 km thick and its weight has depressed the continent below sea level in many places. If this weight were removed, the continent would slowly rise and readjust itself, as Europe still does after the melting of the ice sheet that covered that continent during the last ice age. Ice caps are smaller than ice sheets. They form when snow and ice fill a basin or cover a plateau to a considerable depth. Ice fields develop where large interconnecting valley glaciers are separated by mountain peaks and ridges that project through the ice.o ice sheet ais Fi:tn. 冰原 o mass mAs n. 块 o depress di5pres v. 使降低 o readjust ri:E5dVQst v. 重新调整 o melting 5meltiN n. 融化 o ice age ais eidVn. 冰河时期 o ice cap ais kApn. 冰冠 o basin 5beisn n. 盆地 o plateau plA5tEu n. 高地 o considerable kEn5sidErEbl adj. 相当大的 o ice field ais fi:ldn. 冰原 o interconnecting 7intEkE5nektiN adj. 互相连接的 o valley 5vAli n. (山)谷 o peak pi:k n. 山顶 o ridge ridV n. 山脊 o project 5prCdVekt v. 凸出 148As glaciers move over bedrock they scrape and abrade its surface, producing fine-grained rock flour. Glaciers can also pluck away rocks up to boulder size and transport and deposit them along the margins of the glacier down in the valleys. The glaciers deposit these materials as till, a sediment consisting of mud, sand, gravel, and boulders. Much of this material is deposited in long mounds called moraines. Lateral moraines are formed on each side of a valley glacier where abraded sediment and plucked rocks are deposited.o move over mu:v 5EuvE v. 挪开 o bedrock 5bed7rak n. 岩床 o scrape skreip v. 刮擦 o abrade E5breid v. 磨损 o fine-grained fain reindadj. 纹理细腻、平整的 o flour 5flauE n. 细软的粉末 o pluck away plQk E5weiv. 冰川冲走(岩石) o boulder 5bEuldE n. 巨砾 o deposit di5pazit v. 使沉积 o margin 5mB:dVin n. 边缘 o till til n. 冰碛 o gravel 5rAvEl n. 砂砾 o mound maund n. 堆 o moraine mE5rein n. 冰碛 o lateral moraine 5lAtErEl mE5reinn. 冰川侧碛149Many glaciologists believe that the current worldwide retreat of glaciers is influenced by global warming. They believe global warming is caused by the buildup of greenhouse gases in the atmosphere since humans began using fossil fuels during the Industrial Revolution. Higher average temperatures are causing glaciers to melt faster than they can be replenished by winter snows.o glaciologist 7leisi5alEdVist n. 冰河学家 o retreat ri5tri:t n. 冰川后退 o global warming 5lEubEl 5wC:miNn. 全球变暖 o buildup bildQp n. 累积 o greenhouse gas 5ri:nhaus As n. 温室气体 o fossil fuel 5fasl fjuEln. (煤、石油、天然气等)矿物燃料 o replenish ri5pleniF v. 补充 150The farther a glacier moves from its source of accumulation into warmer, lower-elevation regions, the more likely it is to ablate, or melt. As the ice ablates, it begins to deposit the material it has eroded in the mountains, as well as any rock debris that has fallen into its crevasses. Just as streams of liquid water create landforms when they deposit their load of material, streams of frozen waterglaciersdrop their burden and shape the landscape as they recede.o elevation 7elE5veiFEn n. 海拔 o ablate Ab5leit v. 融化 o melt melt v. 融化 o erode i5rEud v. 侵蚀 o debris 5debri: (plural: debris debri:z) n. 碎片 o crevasse krE5vAs n. 裂缝 o burden 5bE:dn n. 负载 o landscape 5lAndskeip n. 地形 o recede ri5si:d v. 后退 151Moon is the only natural satellite of Earth. The natural satellites of the other planets in the solar system are also sometimes referred to as moons. Telescopes have revealed a wealth of lunar details since their invention in the 17th century, and spacecraft have contributed further knowledge since the 1950s.o moon mu:n n. 月球 o satellite 5sAtElait n. 人造卫星 o solar system 5sEulE 5sistEmn. 太阳系 o refer to sb / sth as ri5fE: tu: 5sQmbadi/5sQmWiN Azv. 称某人/某物为 o reveal ri5vi:l v. 揭示,显示 o a wealth of ei welW Evadj. 很多的 o lunar 5lu:nE adj. 月球的 o spacecraft 5speiskrB:ft n. 宇宙飞船 o contribute kEn5tribju:t v. 贡献 152As the Moon orbits Earth in a counterclockwise direction, Earth itself rotates counterclockwise (from west to east) on its axis and revolves around the Sun in a counterclockwise orbit.o orbit 5C:bEt v. 绕(吸引中心)运转 n. 轨道 o counterclockwise 7kauntE5klCkwaiz adj. 逆时针方向的 o rotate rEu5teit v. 自转 o axis 5Aksis n. 轴(plural: axes 5Aksiz) o revolve ri5vClv v. 公转 153The Moon is full when it is farther away from the Sun than Earth; it is new when it is closer. When it is more than half illuminated, it is said to be in gibbous phase. When it is less than half illuminated, it is said to be in crescent phase. The Moon is said to be waning as it progresses from full to new, and to be waxing as it proceeds from new to full.o full ful n. 满月 o new nu: n. 新月 o illuminate i5lu:mEneit v. 照亮,使明亮 o gibbous 5ibEs adj. 光亮部大于半圆的 o phase feiz n. 位相 o crescent 5kresnt adj. 新月形的 o crescent phase 5kresnt feizn. 新月位相 o waning 5weiniN adj. (月亮)渐亏的 o waxing 5wAksiN adj. (月亮)渐盈的154By a cosmic coincidence, the apparent sizes of the disk of the Moon and the disk of the Sun are approximately the same when seen from Earth. If the Moons orbit lay exactly in the plane of Earths orbit around the Sun, a solar eclipse would occur somewhere on Earth every month at new moon. However, solar eclipses occur only about 2 to 5 times a year. Partial eclipses, when the Moon only partially covers the disk of the Sun, happen more often than total eclipses. o cosmic 5kazmik adj. 宇宙的 o coincidence kEu5insidEns n. 巧合 o approximately EprRksE5mEtli adv. 大约 o lay lei v. 位于 o plane plein n. 平面 o eclipse i5klips n. 食 o occur E5kE: v. 出现,发生 o solar eclipse 5sEulE i5klipsn. 日食 o partial eclipse 5pB:FEl i5klips n. 偏食 o total eclipse 5tEutl i5klipsn. 日全食 155The Moons surface is covered with craters overlain by a layer of soil called regolith. Nearly all the craters were formed by expl
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