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Science Q3 Sief

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Bedrock   The bottom layer of soil, made mostly of soild rock  
Topsoil   The top layer of soil, made in part from broken pieces of lower layers of rock  
Physical weathering   caused by wind, water, plants, and ice  
Chemical weathering   It occurs when chemicals break up rocks by dissolving parts of them  
Fossils:   Any naturally preserved evidence of past life  
Mold:   An impression of an organism formed when sediment hardens around the organism .  
Cast:   A fossil of an organism formed when sediment fills a mold and hardens.  
Fossil fuel:   An energy-­‐rich resource formed from the buried remains of once-­‐living organisms.  
Index fossil:   A fossil of a type of organism that lived in many places during a relatively short time span.  
Mass extinction:   A period during which a large number of species become extinct.  


   






 
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Created by: mohamedelhussien