Download Evidence For Evolution

Fossils
Kind of like a photo of the past.
Fossil Formation
 Organism dies
 Soft parts
decompose
 Sand or mud
accumulate on top of
bones
Fossil Formation
 Mud or sand turns into
sedimentary rock.
 Bones are replaced
by minerals from
water seeping through
rock.
 Form new rock
shaped like original
bone.
Fossils are Rocks
 Fossils are rock
crystals replacing
bone that dissolves.
Fossils are Like Geodes
 Geodes are empty
places in rock that
fill with crystals
formed from
dissolved minerals
crystallizing from
water.
Fossil Formation
 For a QuickTime movie go to:
www.pbs.org/wgbh/evolution/educators/teach
studs/unit3.html