Q1W4 EALS Magmatism

Multiple Choice

Which is an example of endogenic process?

• Ice melting

• Typhoons

• Weathering

• Rock melting

Multiple Choice

The temperature of the Earth <blank> as the depth <blank> towards the core.

• decreases, decreases

• decreases, increases

• increases, decreases

• increases, increases

Match

Match the following temperature of the lithosphere.

• 15 to 30^οC

• 1000^οC

• 3500^οC

• 6000^οC

1 km

Base of the crust

Base of the mantle

Center of the Earth

• 1 km

• Base of the crust

• Base of the mantle

• Center of the Earth

Multiple Choice

All are sources of Earth’s internal heat EXCEPT

• endogenic heating

• frictional heating

• heat from formation and accretion

• radioactivity

Multiple Choice

What is the process of growth through gradual accumulation of layers called?

• acceleration

• creation

• accretion

• formation

Reorder

Arrange the following chronologically from beginning (1) to end (3) of the formation and accretion of the planet which resulted to Earth's internal heat.

• Accretion of dust in space to form planetoids

• Theia merging with Earth forming the moon

• Bombardment of asteroids & comets.

1

2

3

• 1
• 2
• 3

Multiple Choice

What causes frictional heating?

• Sinking of denser core to the center of the plant

• Formation of the lithosphere

• Formation & accretion of the planet

• Radioactivity

Fill in the Blank

TRUE or FALSE. Heat coming from radioactive minerals is lesser than when the Earth was formed

Multiple Choice

Evaluate the following statements about magma and lava and select the correct answer.

• Magma and lava are the same.

• Magma is within the interior of the Earth while lava is at the surface.

• Lava is within the interior of the Earth while magma is at the surface.

• Magma and lava come from the same environment.

Fill in the Blank

Are magma created in the outer core? Why or why not?

.

.

Multiple Choice

What chemical composition makes up most of magma?

• Silicon and oxygen

• Aluminum and silicon

• Iron and oxygen

• Aluminum and iron

Multiple Choice

Evaluate the following and identify which of the following is NOT CORRECT about magma formation.

• It is formed from melting of rocks

• It is formed in the asthenosphere.

• It is formed at temperatures of 600°C and 1300°C

• It is formed from solidification of rocks.

Multiple Choice

Magma chambers are usually found in places with high temperature and pressure. Where are these located?

• Both divergent and convergent plates

• Divergent plates

• Convergent plates

• Central areas of the continents

​Watch the video of decrompression melting

Multiple Choice

Magmas are formed with decompression melting. When does this happen?

• There is an increase in temperature

• Impurities like water H₂O or carbon dioxide CO₂ are added to rock

• There is a reduction in pressure.

• There is an increase in pressure

Multiple Choice

Magmas are formed with flux melting. When does this happen?

• There is an increase in temperature

• Impurities like water H₂O or carbon dioxide CO₂ are added to rock

• There is a reduction in pressure.

• There is an increase in pressure

Multiple Choice

What magma type has the highest silicon and oxygen content?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type has the highest gas content?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type has the lowest gas content?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type is the most viscous?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type is the least viscous?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type tend to erupts explosively?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

What magma type tends to flow out dramatically as a lava?

• Basaltic

• Andesitic

• Felsic

• All magma types

Multiple Choice

Magmas with higher SiO₂ most likely contain higher gases and are more viscous. When a volcano erupts with this kind of magma, what kind of eruption would you expect?

• Slow

• Explosive

• None of the choices

• Dramatic with lava flowing out like a river

Open Ended

What do you think will happen if the center of the Earth is not hot?