Earth's outermost layer. 8 km down.
The layer directly beneath the crust.
The intermost layer of the Earth.
The cool, solid portion of the Earth. It floats on the asthenosphere and includes all of the crust and upper mantle.
A zone of partially melted rock in the upper mantle.
The theory scientists use to explain plate movements. Word comes from from Greek work meaning "builder" because plate movements build Earth's largest landforms.
A plate boundary where two plates move away from each other.
A plate boundary where two plates move toward each other.
Transform Fault Boundary
A plate boundary where two plates grind past each other.
Mid- Ocean Ridge
A chain of mountains that runs 83,000 km through all of the world's oceans.
Highest point of the Mid- Ocean Ridge. Formed where two plates move apart [a divergent boundary].