14.2 Eruptions Review

Front

What is the magma chamber in a volcano?

Back

The magma chamber is a large underground pool of molten rock (magma) located beneath the surface of a volcano, where lava is stored before an eruption.

Front

What type of magma is typically found in shield volcanoes?

Back

Basaltic magma, which is low in viscosity and allows for gentle eruptions.

Front

What effect does an increase in silica have on magma?

Back

An increase in silica increases the viscosity of magma, making it thicker and more resistant to flow.

Front

Which type of volcano is known for its explosive eruptions?

Back

Cinder cone volcanoes are known for their explosive eruptions due to the high gas content in their magma.

Front

Does pressure increase or decrease with depth below the Earth's surface?

Back

Pressure increases with depth below the Earth's surface.

Front

What is the primary characteristic of basaltic magma?

Back

Basaltic magma has a low viscosity and retains little gas, leading to less explosive eruptions.

Front

What is the difference between composite volcanoes and shield volcanoes?

Back

Composite volcanoes are characterized by steep slopes and explosive eruptions, while shield volcanoes have gentle slopes and non-explosive eruptions.

Front

What role does temperature play in the viscosity of magma?

Back

An increase in temperature decreases the viscosity of magma, allowing it to flow more easily.

Front

What is a conduit in a volcano?

Back

A conduit is a passage through which magma travels from the magma chamber to the surface during an eruption.

Front

What are hot spots in relation to volcanic activity?

Back

Hot spots are locations where magma from deep within the Earth's mantle rises to the surface, creating volcanoes independent of tectonic plate boundaries.