Quiz on Magmatism

What is the process through which magma is formed in the Earth's crust and mantle?

• Complete melting

• Partial melting

• Evaporation

• Solidification

What is the term for melting that occurs due to a decrease in pressure?

• Flux melting

• Decompression melting

• Partial melting

• Complete melting

What happens to magma as it rises towards the Earth's surface?

• It evaporates

• It solidifies

• It melts surrounding rock

• It cools down

What is the main factor that triggers partial melting in rocks?

• Increase in pressure

• Addition of volatiles

• Decrease in temperature

• Increase in pressure and temperature, volatiles

What is the effect of adding volatiles to rocks that are close to their melting point?

• It has no effect

• It triggers partial melting

• It increases the melting point

• It solidifies the rocks

What geological feature is associated with decompression melting?

• Volcanoes

• Earthquakes

• Mid-Ocean Ridge

• Mountain ranges

What happens to mantle rocks during convection?

• They remain at the same depth

• They go deeper into the mantle

• They rise to shallower levels

• They melt completely

What is the primary characteristic of flux melting?

• It occurs without the addition of volatiles

• It requires high pressure

• It occurs with the addition of volatiles

• It is a rare process

What happens to the melting point of minerals when volatiles are added?

• It increases

• It decreases

• It remains the same

• It becomes unpredictable

What is the effect of rising magma on surrounding rocks?

• It solidifies them

• It melts them

• It cools them down

• It has no effect