Fossils are dead animals or plants.They are usually skeletons found embedded in rock .Sometimes fossils are footprints or poo.
Small animals or insects get stuck in tree sap which hardens and traps them forever .Large animals can get trapped in ice,or their carcass gets trapped in layers of rock.Over thousands of years,pressure builds up and the skeleton is dissolved by water under the ground.
Next the mould left in filled with minerals that form rock.
This rock shape is the fossil-an exact replica of the dinosaur.This process takes 10,000 years.
Palaeontologists find fossils when the top layer of dirt or rock washes away.
WORDS
Dissolved,mould,erodel,mammoth,climate
vital,Siberia,carcass.
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