Water, Water, Everywhere NSTA Leaning Center：水水到处 NSTA学习中心

1、water, water, everywhere?anuradha koratkar, susan hoban,albert hill, andbrendan shaughnessywater is the driver of nature. - leonardo da vincilet us brainstorm the importance of water to life 1. 2. 3. 4. 5. 6. water is a necessity for every form of life knowndoes anyone have any other suggestion?use

2、the chat to respond, or *6 on your telephone importance of water to life water to drink; we need to stay hydrated to remain alive; we are 55 75% water! solar energy converted by plants; water is the catalyst that helps plants grow. water vapor in the atmosphere traps radiation and warms up the earth

3、. earths oceans affect climate and store heat.importance of water in space exploration water to drink. water to grow plants. water can be broken apart to make air (oxygen) and rocket fuel (oxygen + hydrogen). water for protection. water is heavy, too expensive to carry.where can we find water?water

4、in the solar system - comets detected in comets tails. up to 80% can be water ice. indications that water once flowed on the surface. much of the water may exist as subsurface ice.water in the solar system - marswater in the solar system - mars polar ice caps are mostly frozen carbon di-oxide and tr

5、ace amounts of water.water in the solar system europa and ganymede cracked surface with many fissures there may actually be a liquid ocean under the ice! europaganymedewhy is water unusual? earth is the only known location in the solar system where liquid water exists. all three states of water are

6、found on earth. solid form, ice, is less dense than the liquid form.water in the earth-moon systemcomets and asteroids may have provided all the water on earth.the earth and moon are about the same distance from the sun. the earth has plenty of evidence for water in all states. we do not see such ev

7、idence on the moon.why is water not abundant on the moon? 1. 2. 3. 4. 5. 6. temperature and distance temperature of a planet depends on distance from the sun the greenhouse effectmercuryvenusearthmarsjupitersaturnuranusneptuneplutophase diagramspressuretemperature1 atmphase diagram for water1 atmliq

8、uidgassolidpressuretemperature (c)0100tcfacts about the moonthe temperature on the moon is expected to be -20 degrees c because of its distance from the sun.a “day” on the moon is 14 earth daysthe recorded temperatures are -233 degrees c (night-time) and 123 degrees c (day-time)gas can be heated to

9、high temperaturesthe moon is smaller than the earth.one-sixth the gravity so gas can escapemoon has no atmospherepoll questionwhat can you say about water if we put all these facts together?can there be ice on the moon? comets and asteroids could have left water on the moon just like on earth effect

10、s of temperature and pressure implies water sublimates in sunlight and drifts off into space. but the moon has deep cold craters where sunlight cannot reach! water may exist in such places as frozen icethere are many craters near the poles that are permanently shadowedsouth polenorth polewhat is the

11、 evidence for ice on the moon? lunar prospector shows enhancement of h, indicating possible presence of icewhat is the evidence for ice on the moon?lunar prospector and clementine: signs of ice in shadowed craters near the moons poles-perhaps as much as a cubic kilometer. radio and optical observati

12、ons of crash site show no water. there is no conclusive evidence.the search for ice on the moon search permanently shadowed craters at the moons poles detect ice crystals in lunar soil map the temperature of the moon search for regions that could have hydrogen-bearing compounds like waterif you have any questions let us discuss them on the discussion listserv. flavio will send everyone a link in case you are not subscribed to it.for those of you working on earning two credits