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II
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V
100

The general name for a mass of underground volcanic rock

What is an igneous intrusion?

100

The earthquake scale used to publish a ShakeMap

What is the modified Mercalli scale?

100

Deposits of sand and mineral fragments that cover most Earth's surface

What are sediments?

100

The middle of the earth's three main layers 

What is the mantle?

100

The type of mountain that forms when molten rock erupts from a hole in the earth's crust

What is a volcanic mountain?

200

The point on the earth's surface directly above where an earthquake begins

What is the epicenter?

200

The bowl-shaped hollow formed by the collapse of an underground magma chamber

What is a caldera?

200

Consists primarily of erupted volcanic ash and rock fragments held loosely together

What is a cinder-cone volcano?

200

The boundary line between the crust and the mantle

What is Moho (Mohorovicic discontinuity)?

200

Lava in water solidifies almost instantly, forming rounded structures

What is pillow lava?

300

The actual underground source of a volcanic eruption

What is the magma chamber?

300

Smaller earthquakes that often follow a larger earthquake at frequent intervals

What are aftershocks?

300

The inner core of the earth is thought to be this

What is solid?

300

The earth's outer layer made of solid rock

What is the crust?

300

The study of the earth

What is geology?

400

The point deep in the earth where an earthquake begins

What is the hypocenter?

400

Molten rock pushes up overlying rock layers without reaching the surface

What is how domed mountains form?

400

Volcano that probably will not erupt again

What is an extinct volcano?

400

An opening in the earth's surface through which hot gases, ash, and molten rock are ejected from the earth's interior

What is a volcano?

400

Hardened lava that forms rough, jagged rocks with a crumbly texture

What is AA?

500

The fastest type of earthquake waves

What are P waves?

500

The way the Ring of Fire provides evidence for plate tectonics

What is that most volcanoes appear to be located along subduction zones?

500

The large almond-or teardrop-shaped pieces of ejecta formed when lava solidifies after being thrown high into the air

What is a volcanic bomb?

500

The most abundant element in the earth's crust

What is oxygen?

500

Solid particles less than 2 mm in diameter

What is volcanic ash?