A mountain formed when molten rock erupts from a hole in the earth's crust

The most famous scale of earthquake strength, which rates earthquakes on a scale of 1 to 9

The layer of the earth thought to be solid iron or nickel

A volcano that has erupted within recorded history or is currently producing seismic activity

The study of the earth

A mountain formed when two rock layers are pushed together, causing layers to buckle

The point at which an earthquake begins

The middle of the earth's three layers

An active volcano that could erupt again

Forms when bending or buckling of rocks under great force

A mountain formed when molten rock collects beneath an overlapping rock layer, forcing the layer upward into a blister-like structure

The point on the earth's surface directly above the focus point

Deposits of sand, mineral fragments, or organic materials usually left by wind or water that cover the earth's crust

A volcano that consists primarily of erupted volcanic ash and rock fragments called cinders

The study of earthquakes

A mountain formed when rocks on one side of a fault are forced upward and the rocks on the other side are forced downward

An instrument used to record the vibrations caused by earthquakes

The area between the upper and the lower mantle

Volcanoes that produce both cinders and lava; produce symmetrical, wide-based mountains that consist of alternating layers of lava and cinders

The place where about 80% of all earthquakes occur

The theory that states the earth's crust and upper mantle consist of huge plates slowly drifting because of convection currents in the mantle

A broad, gentle sloping volcano that pours out large quantities of highly fluid lava in rather mild eruptions