Astronomy

*Why is the distance between Earth and the sun most important?

• The distance prevents solar flares from reaching Earth's atmosphere.

• The distance is the source of Earth's magnetic field.

• The distance causes the different seasons on Earth.

• The distance contributes to Earth's ability to support life.

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*Which contributes to Earth's ability to sustain life?

• The atmosphere allows all of the sun's radiation to enter due to Earth's distance from the sun.

• The atmosphere prevents all space debris from reaching the surface due to the ozone layer.

• The atmosphere is extremely thin due to the temperatures of the sun.

• The atmosphere is breathable due to the unique mixture of gases.

*How does gravity support life on Earth?

• by forcing Earth to continuously spin on its axis, which contributes to day and night

• by causing changes in the distance between Earth and the sun, which contributes to the seasons

• by keeping water and gases in the atmosphere close to Earth's surface, which contributes to life processes

• by preventing meteors and comets from hitting Earth's surface, which protects living organisms from space fragments

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*Which factor makes Earth different from all the other planets in the solar system in its ability to support life?

• The Earth is exposed to rays from the sun.

• The Earth has only one moon that orbits around it.

• The Earth rotates in an elliptical orbit around the sun.

• The Earth has a breathable atmosphere.

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*What property of water is most important for living organisms?

• It is odorless.

• It does not conduct electricity.

• It is tasteless.

• It is liquid at most temperatures on Earth.

*What planet contains oceans and frozen ice caps?

• Jupiter

• Mars

• Earth

• Neptune

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*What planet has a very hot surface and is most like Earth in size?

• Venus

• Mars

• Mercury

• Uranus

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*The chemical makeup of the Sun is mostly __________.

• hydrogen and oxygen

• hydrogen and helium

• oxygen and helium

• hydrogen, helium, and sulfate

*Which is the eighth planet from the Sun?

• Uranus

• Saturn

• Jupiter

• Neptune

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*Which property makes Earth unique compared to other planets in the solar system?

• It orbits the Sun.

• It has liquid water.

• It is a rocky planet.

• It rotates on its axis.

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