Convection in the Atmosphere and Oceans

The transfer of heat energy through liquids and gasses due to uneven heating is called:

• Convection

• Conduction

• Radiation

• Revolution

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In coastal areas, at night, the breeze moves:

• From the ocean to land (Sea Breeze)

• From the clouds to water due to precipitation

• From the land towards the ocean (Land Breeze)

• From the surface to the stratosphere

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Ocean currents move warm water:

• From the equator to the poles

• From the poles to the equator

• From the Atlantic to the Pacific

• Along the Antarctic flow

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The deep ocean current that moves water around the globe is known as:

• The Thermocline

• The Pycnocline

• The Thermohaline

• The Halocline

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Warm air rises and the cool air sinks demonstrates this type of heat transfer. 

• conduction

• convection

• radiation

• Insolation 

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• A

• B

• C

• D

Answer explanation

Warm air rise and cool air sinks

warm air is less dense

cool air is more dense so it sinks

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NGSS.MS-ESS2-6

A student models convection currents in a laboratory activity. How are the convection currents in the student's model different from the convection currents in Earth's atmosphere and oceans?

• The warm air in Earth's atmosphere and the warm water in Earth's oceans sink instead of rise.

• The heat source for Earth's atmosphere and oceans is the sun, which heats from above instead of below.

• Convection cells in Earth's atmosphere and oceans flow in the same direction instead of opposite directions.

• Cold air in Earth's atmosphere and cold water in Earth's oceans are less dense that warm air and warm water instead of being more dense.

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How are the convection currents in the student's model different from the convection currents in Earth's atmosphere and oceans?

• The warm air in Earth's atmosphere and the warm water in Earth's oceans sink instead of rise

• The heat source for Earth's atmosphere and oceans is the sun, which heats from above instead of below

• Convection cells in Earth's atmosphere and oceans flow in the same direction instead of opposite directions

• Cold air in Earth's atmosphere and cold water in Earth's oceans are less dense than warm air and warm water instead of being more dense

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112.20.b.10.A

Convection causes ocean currents because:

• Cold salty water rises, and warm less dense water sinks

• warm dense water rises, and cold less dense water sinks

• cold salty water sinks, and warm less dense water rises

• warm sinks and cold rises regardless of density

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What is a convection current?

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