Earth-Moon-Sun

The length of a year on Earth is a little over 365 days. The length of a year on a planet is BEST described as the time it takes for which to occur?

• the planet to revolve once around the Sun

• the seasons to complete a full cycle

• the planet to rotate once on its axis

• the Sun to rotate once on its axis

• 1, 4, 3, 2

• 4, 3, 1, 2

• 3, 4, 2, 1

• 3, 2, 1, 4

Blanca wants to show her class the importance of the tilt of Earth in seasonal changes. She drew four diagrams on the board. Which diagram correctly shows when it is winter at Point X?

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The Moon is in orbit around Earth. What keeps the Moon from changing its orbit?

• friction

• gravity

• weight

• rotation

Why are there high and low tides on Earth?

• They are due to changes in the moon’s tilt on its axis.

• They are due to the gravitational pull between Earth and the moon.

• They are due to the magnetic force between Earth and the moon.

• They are due to changes in the moon’s speed every month.

Planets remain in orbit around the Sun because of

• gravity

• friction

• solar energy

• centrifugal force.

Which of these BEST describes when a lunar eclipse will occur?

• when Earth is between the Moon and the Sun

• when the Moon passes between Earth and the Sun

• when the Sun is between Earth and the Moon

• when Earth is at a 90° angle to the Moon and the Sun

For a science activity, Mia had to draw a picture of the Moon each night. If Mia drew a new

moon, what type of moon did Mia draw about one week later?

• full moon

• new moon

• first quarter

• waxing gibbous

The planets in the solar system revolve around the Sun because the Sun is

• made of hydrogen and helium.

• older than other objects in the solar system.

• the source of most heat and light energy.

• the strongest source of gravity in the solar system.

What keeps the planets in orbit around the Sun?

• tides

• gravity

• electricity

• magnetism