Unit C Chapter 1

The inner core is the hottest layer of the Earth.

The mantle is thickest layer of Earth that is made of solid and melted rock?

Scientists use seismographs, Mercalli scale, and the Richter scale to measure earthquakes .

California has more than 20,000 earthquakes each year because there is a large fault running through the state.

New ocean floor forms as plates move apart and magma rises to the surface of the crust

Different kinds of eruptions form different kinds of volcanic mountains.

Crust is the layer of Earth that includes land and ocean floor.

The core the deepest layer of Earth.

Plates are continent-sized slabs that make up the crust and upper mantle.

An earthquake is the shaking of the Earth's crust.

A fault is the break in the Earth's crust along which rocks move.

A focus is the underground point where an earthquake first starts.

The epicenter is the point on the Earth's surface right above the focus of an earthquake.

A seismograph is the instrument that records earthquake waves.

A volcano is a mountain that forms when red-hot melted rock flows through a crack onto the Earth's surface.