Moon and earth Flashcards

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1
Q

What keeps the sun, earth and moon in orbit?

A

Gravity

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2
Q

How can we see the moon if it doesn’t generate its own light?

A

It reflects the sun’s light.

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3
Q

How long does it take the moon to orbit the earth?

A

29,5 days

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4
Q

Name the 8 phases of the moon

A
  1. New moon
  2. waxing crescent
  3. first quarter
  4. waxing Gibous
  5. full moon
  6. waning Gibous
  7. last quarter
  8. waning crescent
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5
Q

Define gravity

A

The forces all objects exert on all other objects

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6
Q

Define ‘mass’

A

The amount of matter in an object

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7
Q

Define ‘weight’

A

The force gravity exerts on an object

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8
Q

What keeps the moon in orbit around the earth?

A

The earths gravitational force attracting the moon.

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9
Q

What two factors affect the force of gravity?

A

The mass of each object and how far they are apart from each other.

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10
Q

What causes the ocean tides?

A

Gravitational pull of the moon on the oceans.

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11
Q

Why does the sun not significantly affect the tides when it is so much bigger than the moon?

A

The sun is so much further from the earth and thus has a weaker gravitational pull on the ocean.

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12
Q

What causes Spring tides?

A

When the sun and moon are aligned.

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13
Q

What is the inter-tidal zone?

A

The area of a shoreline between high and low tide.

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