Volcanoes are scattered randomly across Earth's surface.

Many Volcanoes occur along the mid-Atlantic Ridge.

The only place where the mid-Atlantic ridge is above sea level is

Volcanoes for at

Many volcanoes are located

Volcanoes form in a subduction zone where a tectonic plate

Feature that forms when magma flows onto Earth's surface

name for melted rock under Earth's surface

name for melted rock after it flows onto Earth surface

The 1985 Mount St. Helens eruption was the biggest volcanic eruption that ever occured

All volcanic eruptions involve explosions

A volcanic eruption may be more powerful than a nuclear explosion

Which statement about Mount St. Helens is false?

Compared with solid rock around it, magma is

The deepest magma chamers are about

A non-explosive volcanic eruption may release a large quantity of

region within Earth that is surrounded by solid rock and contains magma

any release of magma onto Earth's surface

hot volcanic rock thrown into the air by an explosive eruption

Thickest type of non-explosive lava

Many composite volcanoes are found in the Pacific Ring of Fire

All volcanoes release ashes, gases and pyroclasts

Composite volcanoes have steep sides because the lava cannot flow very far

The largest supervolcano in North America is Yellowstone

Cinder cones always erupt over a long period of time

Composite and shield volcanoes differ in their

Composite volcanoes are common at

Cinder cones are composed mainly of

A supervolcanoe

A large, bowl-shaped depression that forms at the top of some volcanoes

smallest and most common type of volcano

example of a shield volcano

volcano with a broad base and steep sides

Intrusive igneous rocks are never visible on Earth's surface

The water in hot springs is heated by magma

A lava dome is any mountain that forms from lava

The lava that forms a lava dome is thin and runny

Which statement about geysers is false?

When lava is thick it

Which statement about hot springs is false?

Lava that flows from vents at mid-ocean ridges

hot water that seeps out of a crack at the surface

igneous rock formation that results when lava cools in the middle of a volcanic crater

hot water under pressure that forcefully erupts out of the surface

volcanoes occur only in oceanic crust

The molten rock of a volcano comes from Earth's core

Examples of volcanic arcs that formed at convergent plate boundaries include the

Which U.S. state formed over a hot spot in an oceanic plate?

About how many hot spots have scientists identified on Earth?

column of hot rock that lies below a hot spot

crack in Earth's crust where magma pushes up through the crust

location where most volcanoes occur

fixed spot where magma rises through the crust and creates volcanoes

Gases form in a volcano when magma boils and evaporates

A volcano's history can help scientists predict whether a volcano is likely to erupt again

Pillow lava is especially common along mid-ocean ridges.

When a'a lava cools, it forms lava tubes.

The chemistry of magma determines

Signs that a volcano may soon erupt include

For magma to form, solid rock must reach a temperature of at least

volcano that has not erupted in recent history and probably will not erupt again

lava that enters water

volcano that has erupted in recent history and probably will erupt again

Mauna Loa in Hawaii is an example of a composite volcano

Cinder cones usually build up very rapidly

A shield volcano has a flatter top than a composite volcano

Composite volcanoes are also called

A shield volcano

A caldera forms when a

Example of a composite volcano

volcano that produces so much ash that it blocks the sun

volcano that forms a huge, gently sloping mountain

A lava plateau forms when a volcano produces very little lava

Lava from shield volcanoes created the Hawaiian Islands

Intrusions from on the surface and later are buried by sediments

Examples of lava plateaus include the

An intrusion froms when

A geyser forms when underground water is

A type of igneous rock that forms when magma cools below Earth's surface

type of igneous rock that forms when lava cools on Earth's surface

flat surface of igneous rock that forms when thin lava flows over a large area

Cinder cones have gently sloping sides like shield volcanoes

Most large volcanoes have nearby cinder cones

Ash from a volcanic eruption may stay in the atmosphere for years

Gases from a volcano may cause environmental problems

A volcano is more likely to be explosive when lava is thin and runny

Chains of volcanoes form hot spots because of plate tectonics

The Hawaiian hot spot is no longer active

Hot spots never occur under continental crust

The majority of mantle plumes are found under the ocean basins

All hot spots are in the middle of tectonic plates