Quizs: Volcanoes (EHMS V)

Hot melted rock that forms underground near the subduction zone is called ___.

• lava

• sedimentary rock

• igneous rock

• magma

What is an extinct volcano?

• A volcano that has erupted at least once in the last 10,000 years.

• A volcano that hasn’t erupted in the last 10,000 years, but could still erupt.

• A volcano that should never erupt again.

Where do volcanoes typically form?

• At plate boundaries.

• In the middle of tectonic plates.

Which of the following best describes lava?

• Molten rock that has reached Earth's surface

• Solidified ash from a volcanic eruption

• Molten rock beneath Earth's surface

What is magma called when it reaches the surface of Earth?

• Lava

• viscosity

• toxic gas

Which of the following is a primary cause of volcanic eruptions?

• Weather patterns

• Changes in Earth's magnetic field

• Movement of tectonic plates

Which of the following is a characteristic of a cinder cone volcano?

• Broad, gently sloping sides

• Steep sides and built from ash, cinders, and bombs

• Formed only at oceanic ridges

Which layer of the Earth is directly responsible for the formation of magma?

• Crust

• Mantle

• Core

What is a volcano?

• A weak spot in Earth’s crust where magma can come to the surface.

• A mix of rocks, minerals, gases, and water from the mantle.

• Hot semifluid rock that becomes solid rock as it cools off.

• A special kind of mountain.

What is a dormant volcano?

• A volcano that has erupted at least once in the last 10,000 years.

• A volcano that hasn’t erupted in the last 10,000 years, but could still erupt.

• A volcano that should never erupt again.