layers of the earth Flashcards
what is the outer layer?
crust
what is the middle layer?
the mantle
what is the innermost layer?
the core
which layer has life on it?
the crust
how many pieces of evidence support the continental drift?
3
what is the continental drift?
hypothesis that all continents were once joined in a single landmass and have now moved apart
what was the supercontinent called?
pangaea
finish the piece of evidence:
puzzle pieces;…
continents, mountains and coal fields match up
what matched up on different continents, even with oceans between them?
dinosaur fossils
what was found in extremely cold climates that were only found in topical climates?
fossils of tropical plants and rocks
true or false:
the continental drift is a fact.
false; it is a hypothesis
if the earths interior cooled, how would it affect the evidence of continental drift and sea floor spreading spreading and us?
- crops would not grow, giving us no food
- everything would die including trees so we wouldn’t be able to breathe
- pillow like rocks wouldn’t be created because molten material would not be created
- tropical fossils wouldn’t be found in cold climates
- new layers wouldn’t be created
what are the three pieces of evidence for sea floor spreading?
pillowlike rocks, magnetic stripes, drilling samples
what are the three pieces of evidence for continental drift?
fossils, climate, puzzle pieces
what is the definition of sea floor spreading?
mid ocean ridges move apart and create new rock and land
