AnswersPA-Science 8 Q1Conduction

Convection Answers

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1
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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
2
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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.
3

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.
4

Where could convection currents form?

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

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

Question illustration
A
They change to solids near the Sun’s surface.
B
They change to solids near the Sun’s radiation zone.
C
They become more dense near the Sun’s surface.
D
They become more dense near the Sun’s radiation zone.
6

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?

A
stirring powdered cocoa mix into milk
B
touching the warm handle of the cup
C
rising steam from the cup of cocoa
D
pouring the cocoa mix into the milk
7

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.
8

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.
9

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

Question illustration
A
They are farther apart.
B
They have increased in size.
C
They have lost energy.
D
They are moving slower.
10

Which is required for convection to occur?

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

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