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Plate Tectonics (HOW? (2. (Gravity pull crust into the earth., Ridge push…
Plate Tectonics
HOW?
1.
Seafloor is spreading
Middle of the ocean is young (seafloor)
Outside of ocean floor is older
Sediment thick at the edges and thin in the middle.
Magnetic reversals.positive and negative stripes
= seafloor spreading Convergent, Divergent, Transform
2.
Gravity pull crust into the earth.
Ridge push and Slab pull
Convection current
Boundary
Convergent Boundary
Collide
the two plates move towards eachother
2 types of crust
Oceanic crust = made of metals
Continental Crust = made of silica
Divergent Boundary
Divide
Two plates move away from eachoter
only place where new crust is formed
Continental Drift
Evidence
Fossils match
Seperation of continents
Continental drift
Continents were once joined
Ancient climates
same stone in other continents
Fits like a puzzle
Geologic units match
Hot Spots
Stays where it is
creates new volcanoes
The plate moves
so it makes more volcanoes
