Download Plate Tectonic Notes Layer of Earth 1. inner core

Plate Tectonic Notes!
!
Layer of Earth!
1. inner core-hot, solid sphere of iron and nickel,
most dense layer, and hottest layer!
2. outer core- hot, liquid layer of iron and nickel,
less dense than the inner core!
3. mantle-made of rock, thickest layer, less dense
than the outer core !
asthenosphere-semi solid part of the
.
mantle that the lithosphere floats on!
4. crust-upper layer made of rock, less dense than
the mantle!
oceanic crust is thinner but more
dense than the continental crust!
lithosphere- crust and a thin layer of
the upper mantle!
!
Tectonic Plates!
1. tectonic plates are the lithosphere broken into
slabs (large pieces)!
2. Alfred Wegener came up with the theory of
continental drift!
3. Theory of continental drift-says the continents
are slowing moving because the tectonic plates
are moving on the asthenosphere!
4. To support the theory of continental drift
Wegener used the similar rocks and similar
fossils found on different continents !
5. Early studies of the ocean floor helped develop
the theory of plate tectonics because the age of
oceanic crust increases with distance from the
mid-ocean ridge.!
6. Plate movement is caused by convection in the
asthenosphere!
7. Plate movement can be tracked by hot spots!
8. Discovery of magnetic reversals provide more
evidence that plates move away from mid-ocean
ridges.!
9. transform boundary neither create nor destroy
crust.!
10. continental-continental collision- might form a
mountain!
11. convergent boundaries-collide!
12. divergent boundaries-spread apart!
13. transform boundaries-slip past each other!
14. subduction-one plate sinking beneath another!
15. mid-ocean ridge-under water mountain range