jueves, 16 de septiembre de 2010

Vocabulary # 7

Rock = a naturally formed solid in the crust , made up of one or more minerals .

The rock are easy to found but not to take up .









igneous rock = a rock formed when melted rock material cools and hardens .
The igneous rock are cooled intrusive o extrusive .







sedimentay rock = a ock made of bits of matter joined together .


The clay is asediment of shale .









fossil = any remains o impint of living things of the past .



Alots of scientits are find and investigate fossils from dinosaries.












metmorphic rock = a rock formed unde heat and pressue from another kind of  rock.
In the process the original ock does not melt under heat and pressure .









humus = decayed plant or animal material in soil .


Humus is decayed plant or animal mateials .









pollution = adding any harmful substance to earth 's land, water. or air .



Pollution means adding any harmful substance to earth ' s











rock cycle = rocks changing fom one form into another in a never - ending series of processes.




.
Ttake alot of  year .he rock cycle never end and

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