Class

a structure that forms in earth's crust when molten material reaches Earth's surface

a molten mixture of rock-forming substances, gases, and water from the mantle

an area where lava frequently erupts at the surface, independent of plate boundary processes

Once magma reaches the surface, it is known as

Also called a stratovolcano, this is made up of alternating layers of lava flows and ash falls.

A volcano that is dead or causes very little threat of eruption is known as

Also known as a sleeping volcano, this volcano poses little threat but could reawaken someday.

Volcanoes that are the more immediate threat.

An earthquake's ________________ is a single number that geologists use to assign to an earthquake based on the earthquake's size.

The shaking a trembling that results from plate movement shifts which release a large amount of energy is called a(n)

When folding occurs on a large __________, folds that bend upward become mountains and folds that bend downward become valleys.

A ______________ is a break in the rock of Earth's crust or mantle.

A force that acts on rock to change its shape or volume is called stress. One kind of stress as it relates to the earth's crust is ____________, pushing rocks into opposite directions.

a wave or series of waves produced by an earthquake or landslide

convergent boundary

divergent boundary

transform boundary

Sinking movement of ocean floor back into the mantle

Ocean trenches are