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Science Q3 Sief

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.
Created by: mohamedelhussien