Magmatism

What term should be used to describe a semi-liquid hot molten rock located beneath the Earth?

• Lava

• Magma

• Rocks

• Sand

In what part of the earth does magmatism happen?

• Asthenosphere

• Earth’s crust

• Earth’s core

• Lithosphere

What do you call the semi-liquid hot molten rocks found on the surface of earth once the volcano erupts?

• Lava

• Magma

• Rocks

• Sand

During partial melting of magma, where does decompression melting take place?

• convergent boundary

• mid-ocean ridge

• subduction zone

• all of these

Which of the following is NOT a factor of partial melting?

• addition of volatiles

• an increase in pressure

• an increase in temperature

• decrease in pressure

When water or carbon dioxide is added to hot rocks, the melting points of minerals within the rocks decrease. What process is being described?

• decompression melting

• flux melting

• heat transfer

• partial melting

During partial melting, which of the following minerals melt last?

• Biotite

• Feldspar

• Quarts

• None of these

What are the two most abundant elements in magma?

• oxygen and iron

• oxygen and magnesium

• silicon and aluminum

• silicon and oxygen

What will happen to the temperature of rocks during partial melting?

• Decreases

• Increases

• Remains the same

• All of these

During partial melting of magma, where does heat transfer take place?

• convergent boundary

• mid-ocean ridge

• subduction zone

• all of the these