The Evolution of Earth Yup Things change Fossil

The Evolution of Earth Yup… Things change!

Fossil Record • Fossils found in similar areas are evidence for PANGEA

What are fossils? Preserved evidence of long dead organisms BODY FOSSILS vs TRACE FOSSILS • Can all parts of a body become a fossil? TRACE FOSSILS: -PRINTS (foot, leaf… etc) -Burrows -Coprolite - Bones Teeth Shells Petrified Wood

How are fossils made? - Creatures preserved in ice - MINERAL REPLACEMENT Buried under volcanic ash Tree Resin traps items in Amber Mummification – dry climates Tar pits/ Swamps Sedimentary trapped

What do fossils prove? • By determining the age of the fossil, we know the climate of the area that the creature survived in and other clues to help us unlock the past • HOW TO DETEMINE THE AGE OF A FOSSIL?

RELATIVE DATING: determining the age of an object in relation to another object • SEDIMENTARY ROCK layers • LAW OF SUPERPOSITION: lower layers are the oldest

LAW OF CROSSCUTS • If there is a fault or crosscut present, it must be younger than the rock layers which it cuts through • Think you get it? WHO DUNNIT? / Who’s on first

That’s nice, but it’s not the actual date… BUT WE CAN FIND THAT OUT TOO!

LAW OF CONSERVATION OF MASS: Mass is not created or destroyed RADIOACTIVE DECAY- Over time, radioactive material will transform into another form.

RADIOACTIVE DATING: method of determining actual age of an object involves determining the amount of radioactive material in an original sample and looking at it’s half life. HALF LIFE- the amount of time it takes for half of the radioactive material in a rock to decay • https: //www. youtube. com/watch? v=-EYQPc. Gvx 4 c • https: //www. youtube. com/watch? v=ph. Ze. E 7 Att_s • VIDEO: https: //www. youtube. com/watch? v=cpn. Ixl. DVm. Hw