Which Best Describes How Air Moves During Convection

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Which Best Describes How Air Moves During Convection?

In convection hot air rises from the Earth’s surface and becomes cold at higher altitude because of lower temperature there. As it cools it sinks down to the surface of the Earth. On reaching Earth it warms again and rises up again. The main reason for this phenomenon is – sinking cold air pushes the warm air up.

Which description describes air moving in a convection current?

Convection currents rely on the constant cyclical motion of air water and other substances to distribute heat. As heated air rises for example it pulls cooler air into its place — where it can be heated rise and pull in more cool air.

Which best explains why warm air rises above cold air?

warm air is less dense so it rises. the warmed air cools and makes rain.

How do convection currents move?

Convection currents describe the rising spread and sinking of gas liquid or molten material caused by the application of heat. … Inside a beaker hot water rises at the point where heat is applied. The hot water moves to the surface then spreads out and cools. Cooler water sinks to the bottom.

How do convection currents make plates move?

The crust moves because of movements deep inside the earth. Heat rising and falling inside the mantle creates convection currents generated by radioactive decay in the core. The convection currents move the plates. Where convection currents diverge near the Earth’s crust plates move apart.

What happens to the cold air in convection?

Water vapor carried in by convection condenses releasing tremendous amounts of energy. This energy causes the air to expand and rise where it is colder. More condensation occurs in these colder regions which in turn drives the cloud even higher.

What best explains the cause of convection currents in Earth’s atmosphere?

Convection currents are the result of differential heating. Lighter (less dense) warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere in water and in the mantle of Earth.

Which of the following best explains what creates this convection current?

Which of the following best explains what creates this convection current? Salt in the ocean makes it more dense than the land so its gravity pulls more on the air above it. During the day the Sun’s energy heats up the land faster which makes the air above it warmer.

How are convection currents set up in air?

When sun rays hit the land the land gets heated up. Then the air nearest to the land gets heated up too and it becomes lighter and rises up. The air from higher altitude which is cooler and thus heavier sinks down to fill the space left by warm air. This cycle repeats and convection currents are set up.

How do convection occur?

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. … Convection currents can be seen in lava lamps.

What are convection currents What is the direction of movement of convection currents?

The direction of movement and type of plate margin is determined by which way the convection currents are flowing. The heat from the core is transferred to the mantle. Liquid rock close to the core is heated and rises. When it reaches the crust it is forced sideways as often it can not pass through the crust.

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What do convection currents do in the mantle?

Convection currents within the mantle provide one potential driving force for plate movement. The plastic movement of the mantle material moves like the flow of mountain glaciers carrying the lithospheric plates along as the convection movement in the mantle moves the asthenosphere.

What is the process of convection in the mantle?

Mantle convection is the process by which the excess heat in the Earth’s deep interior is transferred to its surface through the fluid-like motions of the rocks in the mantle. … Convection occurs in the Earth’s mantle because it is the most efficient way for the Earth to cool or dispose of its deep-seated heat content.

How do the Earth’s plates move?

Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises cools and eventually sink down. As the cooled material sinks down it is warmed and rises again.

What causes convection in the air?

Convection currents form because a heated fluid expands becoming less dense. The less-dense heated fluid rises away from the heat source. As it rises it pulls cooler fluid down to replace it. This fluid in turn is heated rises and pulls down more cool fluid.

How will you describe the movement of surrounding air?

Air from the surrounding area is sucked into the space left by the rising air. Air flows horizontally at top of the troposphere horizontal flow is called advection. The air cools until it descends. … Air flowing from areas of high pressure to low pressure creates winds.

How does convection produce wind?

The air heats expands and the pressure drop causes air to rise. … In summary: Convection lowers surface pressure which creates a pressure gradient that tries to correct itself by having Air move from higher pressure to the lower pressure area created by the rising air. This correction in pressure is what we call wind.

Which of the following best explains how air and ocean convection cells affect weather?

Which of the following best explains how air and ocean convection cells affect weather? … d) Water vapor and other greenhouse gases trap heat closer to Earth’s surface affecting weather patterns as the trapped warm moist air rises and cools.

What causes convection in the atmosphere quizlet?

Convection is heat transfer by the movement of currents with in a fluid. It is caused by the difference in temperature and density. … Heating and cooling of the fluid changes in the fluid density and the force of gravity combine to set convection currents in motion.

Where do convection currents occur in the atmosphere?

Convection takes place in the atmosphere in the oceans and in Earth’s molten subcrustal asthenosphere. Convective currents of air in the atmosphere are referred to as updrafts and downdrafts. In addition to heat transfer convention can be driven by other properties (e.g. salinity density etc).

Which describes the movement of a fluid during convection?

Which describes the movement of a fluid during convection? Warm fluid rises and cool fluid sinks.

Which best describes the shape of a convection current?

The shape of a convection current would be circular. Convection currents are caused by the very hot material at the deepest part of the mantle rising then cooling sinking again and then heating rising and repeating the cycle over and over.

Which best explains how he plays a role in the movement of materials within Earth’s interior?

Which best explains how heat plays a role in the movement of materials within Earth’s interior? Hot material near the core is less dense and rises and when it cools it becomes more dense and sinks.

Which event is part of a convection current in the air?

A simple example of convection currents is warm air rising toward the ceiling or attic of a house. Warm air is less dense than cool air so it rises. Wind is an example of a convection current. Sunlight or reflected light radiates heat setting up a temperature difference that causes the air to move.

How are air currents set up?

Air current can be set up between two regions having different temperatures. Hot air rises and cold air sinks so air currents form when the atmosphere moves excess hot air from the warmer low latitudes to cooler high latitudes and cool air rushes into replace it.

How do convection currents give rise to breeze in the coastal region?

The ground heats the air above it which rises in convection currents and cooler air from over the ocean flows toward the shore to “fill in the gap” left by the rising warm air. … This flow of cooler air from the ocean toward the shore creates what is known as a sea breeze.

What is meant by convection of air?

Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules making it less dense — rises while the cooler air or liquid drops down. Convection is a major factor in weather.

Where does convection occur?

Convection currents in the Earth occur in the mantle. The core of the Earth is extremely hot and material in the mantle close to the core is heated…

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What is convection current physics?

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