Magma and Volcanism

Energy source is from Earth’s internal heat.

• Exogenic processes

• Endogenic processes

Exogenic processes forms mountain.

• True

• False

Molten rocks found beneath the Earth’s surface.

• Lava

• Magma

• Minerals

• Igneous rocks

Magma that emerges to the surface

• Lava

• Magma

• Minerals

• Igneous rocks

Most common component of magma is magnesium.

• True

• False

Which of the following is not true about magma?

• It has very low temperature.

• Its melting temperature range from 800oC to 1400oC.

• It has the ability to flow.

• It is formed under certain circumstances in special locations deep in the crust or in the upper mantle.

Degree of resistance to flow

(a)  

Volatiles or gaseous substances are added into the hot solid rocks

• Decompression Melting

• Flux Melting

• Heat transfer melting

• None of the above

Melting occur when the temperature stays the same but the pressure decreases.

• Decompression Melting

• Flux Melting

• Heat transfer melting

• None of the above

Melting of surrounding rocks caused by very hot magma that brings in additional heat.

• Decompression Melting

• Flux Melting

• Heat transfer melting

• None of the above