作者Tetsu86 (献给许多的纪念日)
看板EarthScience
标题[请益] 地质学问题X4 请各位帮忙
时间Wed Apr 4 20:48:03 2007
这是学校的地质学作业
有四题实在不知道该怎麽回答
所以请各位大大帮个忙
谢谢!!
ꌊ1.According to plate tectonic theory where are crustal rocks created ?
Why doesn`t earth keep getting larger if rock is continually created?
2.In part of major mountain belts there are sequences of rocks that geologists
interpret as slices of ancient lithosphere. Assuming that such a sequence
formed at a divergent boundary and was moved toward a convergent boundary
by plate motion,what rock types would you expect to make up this sequence ,
going from the top downward?
3.What might explain the remarkable alignment of Cascade volcanoes?
4.A cross-bedded quartz sandstone may have been deposited as a beach sand or
as a dune sand. What features could you look for within the rock to tell if
it had been deposited on a beach? On a dune?
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1F:推 s91220114:哈哈~动动脑筋应该会有些线索 04/05 00:02
2F:推 lthy:感觉上那会是大一普地的作业 XD 04/05 09:56
3F:推 seeback:这几题感觉蛮基本找一下资料就知道答案 04/05 10:25
4F:推 Starblue:这些问题都不难耶.. 不要因为它是英文就觉得她很难呀.. 04/09 15:29
5F:推 haolin:都不难,但挺有趣的...呵呵 04/18 17:02