7.9 A

What is the primary reason Earth's atmosphere is crucial for life?

• It contains large amounts of helium.

• It traps heat and protects organisms from the Sun's damaging rays.

• It is primarily composed of nitrogen and oxygen only.

• It allows for easy space travel.

Which planet is known as the "water planet" due to its liquid water surface and suitable temperature range for life?

• Mars

• Venus

• Earth

• Mercury

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Why does Mercury's surface temperature change drastically?

• It has a very thick atmosphere.

• It is very close to the Sun.

• It has no water and virtually no atmosphere.

• It is covered in ice.

What is unique about Venus's atmosphere?

• It is rich in oxygen.

• It has a thick atmosphere mostly of carbon dioxide with traces of water vapor.

• It is similar to Earth's atmosphere.

• It is the thinnest in the solar system.

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What is the primary reason Earth's Moon is considered an inhospitable place?

• It has a thick atmosphere.

• It is too close to the Sun.

• There is no air to breathe.

• It is covered with water.

What makes Mars's atmosphere different from Earth's?

• It is mostly composed of oxygen.

• It contains a small amount of methane.

• It is warmer than Earth's atmosphere.

• It has a high concentration of water vapor.

How does Earth's proximity to the Sun support life?

• By providing light for solar panels.

• By ensuring the planet is warm enough to support life.

• By keeping the planet completely frozen.

• By generating strong winds.

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What is a common feature of the atmospheres of Jupiter, Saturn, and Uranus?

• They are rich in oxygen.

• They are mostly composed of hydrogen and helium.

• They contain high levels of carbon dioxide.

• They are thin and contain little gas.

Which of these planets has water ice near its poles?

• Neptune

• Mercury

• Mars

• Venus

What is the main component of Mars' atmosphere?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Hydrogen