The sliding of one plate under another is called:

Hot, melted rock within the Earth is called:

Scientists think that plates move because of:

Magma breaks through the crust at:

The innermost layer of the Earth is the:

The plates of the Earth:

One sign that tells scientists that pressure is building inside a volcano is:

What did the bulge on Mount St. Helens tell scientists?

After Mount St. Helens erupted,

Scientists' warnings about volcanic activity can alert people to:

Like other volcanoes in the Ring of Fire, Mount St. Helens sits over a:

A seismograph measures:

The Ring of Fire:

When a hot spot stays put, but the plate above it keeps moving,

As lava or magma cools, it:

The circular movement of material due to temperature is a/an:

Lava coming out of the Earth is __________ about what the inside of the Earth is like.

The hottest part of the Earth is the:

Volcanoes are formed:

As magma rises through the Earth's mantle, it:

Scientists believe magma rises in the mantle because of:

The Earth's crust and upper mantle are made up of about twenty:

Each plate consists of:

When magma reaches the Earth's surface, it is called:

What forms after rising hot melted rock forces its way to the Earth's surface?

Lava that erupts on the ocean floor is called:

A volcano formed by hot lava that flows down the side quickly is called:

A volcano that erupts violently with ash which is typically tall and flat on top is called:

This volcano sometimes spews lava and other times it erupts with cinder and ash. It is tall with a symmetrical cone shape.

Volcanoes that may never erupt again are called:

A volcano that hasn't erupted in 200 years is called:

Volcanoes that are shaking, rumbling, shooting off steam, or erupting are called:

The borders between plates are known as:

Scientists "connect the dots" to find the center of an earthquake, called the:

When anything gets hot, the molecules get:

What do scientists use to compare the size of one earthquake with the size of another?

What is the core of the Earth made of?

A ___________ erupts with boiling water and steam.