Plate Boundaries
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As illustrated in the figure below, there are about ______ major plates and several smaller ones.
12
______________ is the theory that describes how tectonic plates move and shape Earth’s surface.
Plate tectonics
A ________ boundaries occurs where tectonic plates move away from each other.
divergent boundary
A ________ boundary occurs where tectonic plates move toward each other.
convergent
A _________ boundary occurs where tec
transform
Where two tectonic plates are moving apart are called divergent boundaries?
Regions
The lava that erupts at a divergent boundary comes from _______ in the asthenosphere.
Magma
The __________, as you know, consists of plastic but still solid rock.
asthenosphere
_______ in the asthenosphere then melts (partially) to become magma.
Rock
Most __________ boundaries are found along the seafloor, where they form mid ocean ridges.
divergent
What did seafloor spreading evidence show?
Continental and oceanic crust move as tectonic plates.
What are tectonic plates?
Huge pieces of crust and rigid upper mantle.
How many major tectonic plates are there?
How fast do tectonic plates move?
A few centimeters per year.
What theory explains plate movement?
The Theory of Plate Tectonics.
Where do plates interact with each other?
At plate boundaries.
What is a plate boundary?
The edge where two plates meet.
How many main types of plate boundaries exist?
Three types.
What is a divergent boundary?
Where plates move away from each other.
What is a convergent boundary?
Where plates move toward each other.