Magmatism Quiz

What are the two main types of magma?

• Basaltic and rhyolitic

• Dioritic and trachytic

• Obsidian and pumice

• Granitic and andesitic

Describe the differences between mafic and felsic magma.

• Mafic magma has higher iron content and lower silica content, while felsic magma has higher silica content and lower iron content.

• Mafic magma has higher iron and magnesium content and lower silica content, while felsic magma has lower iron and magnesium content and higher silica content.

• Mafic magma has lower silica content and higher iron and magnesium content, while felsic magma has higher silica content and lower iron and magnesium content.

• Mafic magma has higher silica content and lower iron and magnesium content, while felsic magma has lower silica content and higher iron and magnesium content.

How are igneous rocks formed?

• From the solidification of molten rock material

• From the compression of sedimentary rocks

• From the cooling of volcanic gases

• From the evaporation of water

Explain the process of crystallization in the formation of igneous rocks.

• Mineral crystals form first, then molten rock solidifies around them.

• Molten rock cools and solidifies, allowing mineral crystals to form.

• Molten rock turns into sedimentary rock, which then transforms into igneous rock.

• Molten rock evaporates and leaves behind mineral crystals.

What are intrusive igneous rocks and how do they form?

• They form from the accumulation of organic matter over millions of years.

• They form from the cooling and solidification of lava on the Earth's surface.

• They form from magma that cools and solidifies beneath the Earth's surface.

• They form from sedimentary rocks that are exposed to high pressure and temperature.

Give an example of an intrusive igneous rock and explain its formation.

• Marble

• Slate

• Sandstone

• Granite

What are extrusive igneous rocks and how do they form?

• Extrusive igneous rocks form from the evaporation of water and deposition of minerals on the Earth's surface.

• Extrusive igneous rocks form from sedimentary rocks melting and solidifying underground.

• Extrusive igneous rocks form from lava cooling and solidifying on the Earth's surface.

• Extrusive igneous rocks form from the cooling and solidifying of magma deep within the Earth's mantle.

Describe the cooling process of lava to form extrusive igneous rocks.

• Lava cools slowly deep within the Earth's crust

• Lava cools by evaporating into the atmosphere

• Lava cools by being heated to extreme temperatures

• Lava cools quickly on the Earth's surface

What is the composition of magma?

• Hydrogen, helium, carbon, nitrogen, oxygen, neon, iron, copper

• Silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, and potassium

• Nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, water vapor

• Gold, silver, platinum, copper, zinc, nickel, aluminum, iron

Explain the significance of silica content in magma composition.

• Silica content in magma composition is irrelevant.

• Silica content only affects the color of magma.

• Silica content has no effect on magma composition.

• Silica content affects the viscosity and behavior of magma.