viernes, 3 de septiembre de 2010

vocabulary 12

Fault: a crack in the crust, whose sides show evidence of motion.


geologist: a scientist who studies Earht.



magma: hot, molten rock deep below Earht's surface.





lava: magma that reaches Earht's surface.


weathering: the breaking down of rocks into smaller pieces.

erosion: the picking up and carrying away of pieces of rock.

deposition: the dropping off of bits of eroded rock.


meteorite:  a chunk of rock from space that strikes a surface (such as Earth or the Moon)





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