Plate Tectonics
Terms
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- Divergent Plate Boundary
- two plates spread apart at mid-ocean ridges. New sea floor forms
- 2.5 cm/yr
- Plates move at a rate of about---
- Strike-Slip Boundary
- Two plates grind past one another. Earthquakes are very common here
- Convection Currents
- --- are the force moving the plates
- Asthenosphere
- The liquid-y layer that the lithosphere floats on
- Convergent Boundary
- two plates collide and very violent earthquakes happen
- Continental and Oceanic
- The Earth is broken up into 14 plates. The two main types of crust are--
- Hot Spot
- an active mantel plume that spews out magma onto the Earth's surface
- Subduction
- Sea floor is destroyed
- Continental Drift
- Theory created by Alfred Wegner said that the Earth was made of plates