Volcanoes

What is a slushy mixture made of molten rock, mineral crystals, and gases?

• magma

• tephra

• pyroclastics

Which describes all the processes associated with the discharge of magma, hot fluids, ash, and gases?

• plate tectonics

• volcanism

• igneous activity

Where do most volcanoes form?

• at plate boundaries

• in the center of continents

• along continental coasts

Most volcanoes located on land are a result of what type of tectonic plate interaction?

• continental-continental subduction

• oceanic-continental subduction

• oceanic-oceanic subduction

Select all that apply:

Where are the major zones of volcanism?

• Circum-Pacific Belt

• Mediterranean Belt

• Aleutian Belt

Select all that apply:

Magma is a slushy mixture of ____________________

• fossils

• molten rock

• mineral crystals

• gases

Select all that apply:

What is true about volcanoes that form at divergent boundaries?

• Most volcanoes at divergent boundaries occur on land.

• They release large amounts of magma.

• They are nonexplosive.

What are unusually hot regions of Earth's mantle where high-temperature plumes of magma rise to the surface?

• hot spots

• volcanic vents

• lava flows

The Hawaiian Islands are examples of

• divergent volcanoes

• hot spot volcanoes

• convergent volcanoes

Select all that apply:

What can be calculated from the positions of hot spot volcanoes?

• direction of plate movement

• ages of individual volcanoes

• rate of plate movement