What causes the change of seasons on Earth?

• The Earth's distance from the Sun changes throughout the year.

• The Earth's rotation on its axis.

• The Sun moves closer and farther from Earth.

• The Earth's movement around the Sun.

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How far is the Sun from Earth?

• About 150 million kilometers.

• About 150 thousand kilometers.

• About 150 billion kilometers.

• About 150 million miles.

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What do we call the process that allows the Sun to produce energy?

• Photosynthesis.

• Nuclear fission.

• Nuclear fusion.

• Combustion.

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Approximately how hot is the Sun's core temperature?

• About 15,000°C.

• About 1,500°C.

• About 1,500,000°C.

• More than 15,000,000°C.

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What is one effect of nuclear fusion?

• It causes the Sun to rotate on its axis.

• It generates the Earth's magnetic field.

• It produces the energy that reaches Earth as light and thermal energy.

• It is responsible for the Earth's orbit around the Sun.

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What is the term used to describe the motion of one object around another object in space?

• Rotation

• Orbit

• Revolution

• Gravitation

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How long does it take for Earth to make one complete revolution around the Sun?

• 365.24 hours

• 365.24 days

• 24 hours

• 30 days

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What is the shape of Earth's orbit around the Sun?

• Circle

• Nearly a circle

• Straight line

• an oval

What is the effect of the Sun's gravitational pull on Earth's orbit?

• It causes Earth to move in a straight line.

• It has no effect on Earth's orbit.

• It keeps Earth revolving around the Sun in an almost circular path.

• It pushes Earth away from the Sun.

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What would happen to Earth if the Sun's gravitational pull stopped suddenly?

• Earth would continue to orbit the Sun in a circle.

• Earth would fly off into space in a straight line.

• Earth would move towards the Sun.

• Earth would stop moving altogether.

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