Ch 2 Section 3 Internal Forces Shapng the EarthCH 2 3节内力塑造地球

1、ch 2 section 3internal forces shaping the earthplate movement convergent boundariesocean-to-ocean collisionsocean-to-continent collisionscontinent-to-continent collisions building up of mountain chains thickest area of the continental crust suture zones are the result where crust is destroyed as one

2、 plate dives under anotherthis is how the himalayas were formed.divergent plate boundarieswhere new crust is generated as the plates pull away from each otherthe mid-atlantic ridge, a topographically high area near the middle of the atlantic ocean, is an example of a divergent plate boundary.block f

3、aulting, fractures and fissures result from the stress of the plates pulling apartbasaltic magma wells up through fissures creating new surfacenew ocean floor is created (50% of the earths surface has been created in the last 200 million years)divergent plate boundaries usually occur below the sea h

4、owever in africa and north america rifting is occurring on the continenttransnational boundaries no overriding no subduction designated by a fault complex san andreas is an excellent example formed from the gradual subduction of the farallon plate during the cenozoic farallon plate ran along the wes

5、t coast of north america north america plate consumed the middle portion of the farallon plate which left 2 small fragments to the north and south gorda and cocos plates north america plate hit the east pacific rise and overrode the rise so that the actual plate boundary between north america and pacific plates is now the san andreas fault linee