AnswersNC-Physical ScienceConvection

Convection Answers

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

Question illustration
A
They are more spread out and moving faster than those at the surface.
B
They are closer together and moving faster than those at the surface.
C
They are more spread out and moving slower than those at the surface.
D
They are closer together and moving slower than those at the surface.
2
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Which area of Earth is most similar to the sun’s convection zone?

A
the crust
B
the equator
C
the mantle
D
the poles
3

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

Question illustration
A
Thermal energy is transferred.
B
Water molecules gain kinetic energy.
C
Chemical energy is transferred.
D
Water molecules gain thermal energy.
4

Where could convection currents form?

A
in a sand dune
B
on a pavement
C
in the atmosphere
D
in outer space
5

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

Question illustration
A
The magma is cooled and becomes more dense by the core moving it toward the crust.
B
The magma is heated and becomes more dense by the core moving it toward the crust.
C
The magma is cooled and becomes less dense by the core moving it toward the crust.
D
The magma is heated and becomes less dense by the core moving it toward the crust.
6

Which is required for convection to occur?

A
a solid substance
B
a heat source
C
boiling water
D
air molecules
7

A student places a large pot of cold water on a stove and heats it for one minute. Then she takes the pot of water off the burner and places it on the counter. Which best describes the convection currents?

A
Convection currents move thermal energy from the stove to the pot, and then from the pot to the water.
B
After the stove is turned off, convection currents continue to transfer energy through the water for a period of time.
C
Convection currents in the water cause warmer, denser water to rise and transfer energy upward.
D
When the stove is turned on, convection currents cause an increase in the chemical energy of water molecules.
8

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.

Question illustration
A
density
B
temperature
C
kinetic energy of its molecules
D
space between its molecules
9

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?

A
The areas to the sides of the light bulb are warmest because of conduction.
B
The areas to the sides of the light bulb are warmest because of convection.
C
The area directly above the light bulb is warmest because of conduction.
D
The area directly above the light bulb is warmest because of convection.
10

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

A
They transfer potential energy away from Earth’s core toward its crust.
B
They transfer thermal energy away from Earth’s core toward its crust.
C
They transfer chemical and thermal energy in a circular pattern.
D
They transfer chemical and potential energy in a circular pattern.

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