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What are lithospheric plates?
rigid segments of the Earth's lithosphere that move independently over the semi-fluid asthenosphere beneath them, driving geological processes such as earthquakes, volcanic activity, and continental drift.
Who proposed seafloor spreading as the mechanism for continental drift?
Proposed by Harry Hess & Robert Dietz
Divergent plate boundary
- plates move away from each
other
Convergent Boundary
- plates move toward
each other
Transform Boundary
plates slide past each other
Which geologic feature is formed when a divergent plate boundary is under the ocean
mid-ocean ridge
which is formed when it is on a continent?
a rift valley
What is a subduction zone?
where one tectonic plate is forced beneath another, leading to volcanic activity and earthquakes.
What geologic features are formed at subduction zones?
Ocean trenches and volcanic arcs.
What are the 3 types of convergent plate boundaries?
Oceanic-continental, oceanic-oceanic, and continental-continental.
Which 2 form subduction zones?
Oceanic-continental and oceanic-oceanic boundaries.
Explain the 3 mechanisms that drive the movement of plates
slab pull, where a dense oceanic plate sinks into the mantle; ridge push, where new material at mid-ocean ridges pushes plates apart; and convection currents in the mantle, which create flow that moves the plates.
Continental Crust
Thicker but less dense, Granatic Composition
Oceanic Crust
Thinner but less dense Basaltic
