Convection

Question 1

This image shows how magma moves through the Earth’s mantle.

Revolt · Accepted Answer

The magma is heated and becomes less dense by the core moving it toward the crust.

Question 2

Which is required for convection to occur?

Revolt · Accepted Answer

a heat source

Question 3

The lava lamp has a light bulb as a heat source at its base. The lamp contains a colored, waxy fluid that can be observed moving in clumps through a clear liquid.

Revolt · Accepted Answer

density

Question 4

The diagram shows the motion of a group of water molecules over a heat source.

Revolt · Accepted Answer

They are farther apart.

Question 5

When Xavier places his hands near a light bulb, he notices that certain areas around the light bulb are warmer than others. Which best explains this?

Revolt · Accepted Answer

The area directly above the light bulb is warmest because of convection.

Question 6

Water is boiling in a clear pot, as shown in the picture.

Revolt · Accepted Answer

Thermal energy is transferred.

Question 7

Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?

Revolt · Accepted Answer

rising steam from the cup of cocoa

Question 8

The diagram shows the sun’s interior. Convection currents are present in the convection zone.

Revolt · Accepted Answer

They become more dense near the Sun’s surface.

Question 9

Which best describes the convection currents in Earth’s mantle?

Revolt · Accepted Answer

They transfer thermal energy away from Earth’s core toward its crust.

Question 10

In a convection current, as the temperature of a fluid increases, what property of the fluid decreases?

Revolt · Accepted Answer

density

Convection Answers

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