Volcanoes

The strength of an earthquake is known as its

The most famous scale used to measure earthquake strength is the __________________ scale.

lava fragments that solidify almost immediately

Melted Rock

A break that appears in the rock at the boundary between two moving masses of rock:

The point underground when an earthquake begins:

Volcanic fragments called "little stones"

Molten rock that has reached the earth's surface

The belt of volcanoes that encircles the Pacific Ocean is the

Holes or cracks serving as escape vents for underground gases and steam are called fumaroles.

The study of earthquakes is known as

Monstrous ocean waves that may be caused by earthquakes