8th Unit 3 Astronomy

Why do Moon phases affect ocean tides?

• They change Earth's rotation

• They alter gravitational pull

• They create weather patterns

• They influence air pressure

Answer explanation

Moon phases affect ocean tides by altering gravitational pull, causing the water to be pulled towards the Moon, creating high and low tides.

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What phase of the Moon occurs when it is completely illuminated by the Sun?

• New Moon

• Full Moon

• First Quarter

• Waxing Crescent

Answer explanation

The Full Moon phase occurs when the Moon is completely illuminated by the Sun, making it appear as a full circle in the sky.

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What is the phase called when the Moon is not visible from Earth?

• New Moon

• Full Moon

• First Quarter

• Waxing Crescent

Answer explanation

The phase called when the Moon is not visible from Earth is the New Moon phase.

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What is the name of the phase when the Moon is more than half illuminated but not fully?

• Waxing Crescent

• First Quarter

• Waxing Gibbous

• Full Moon

Answer explanation

The name of the phase when the Moon is more than half illuminated but not fully is Waxing Gibbous.

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How long does it take for the Moon to complete one full cycle of phases?

• 14 days

• 30 days

• 27.3 days

• 29.5 days

Answer explanation

The correct answer is 29.5 days because it takes the Moon approximately that amount of time to complete one full cycle of phases.

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What season is it in the northern hemisphere when it is leaning towards the Sun?

• Summer

• Winter

• Spring

• Autumn

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

• 365 days

• 24 hours

• 30 days

• 11 months

Answer explanation

Earth takes 365 days to complete one orbit around the Sun, which is equivalent to one year.

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What is the primary reason for the seasons on Earth?

• Distance from the Sun

• Earth's axial tilt

• Solar flares

• Lunar phases

Answer explanation

The primary reason for the seasons on Earth is Earth's axial tilt.

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What would happen if the Earth's axis was not tilted?

• Same season all year long

• No day and night

• No rotation

• No revolution

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As the earth rotates on its axis, the constellations and stars in them appear to _________.  

• move across the sky
• stand still in the sky
• move around each other

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