3rd Grade Earth Science Review

Which statement about stars other than the Sun is correct?

• Stars are all nearly the same size.

• Stars are so far away they look tiny.

• Stars are much smaller than Earth.

• Stars are all about the same brightness.

Which of the following does NOT describe the Sun?

• The Sun is a yellow star.

• The Sun is the hottest type of star.

• The Sun is made of hot glowing gases.

• The Sun is the closest star to Earth.

During the daytime, a desert can be very hot. At night, the temperature is much cooler.

What causes the differences in day and night temperatures in a desert?

• During the day, the Sun heats the desert, and that heat is lost during the night after the Sun has set.

• The wind takes heat energy that the desert stores during the daytime.

• Heat energy is absorbed by the desert sand at night.

• The Sun gives off less heat energy during the day than it does during the night.

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Terrence is making a poster about energy for a school project. He is placing pictures of objects found in space on his poster. Under each picture, he is writing where the object's energy comes from. Which sentence should he write under a picture of the Sun?

• Sun’s energy comes from the Moon.

• Sun’s energy comes from Earth.

• Sun’s energy comes from nearby stars.

• Sun’s energy comes from within itself.

The Sun provides what two important types of energy?

True or False:

The Sun is the closest star to Earth. All of the other stars are so far away that they look like tiny points of light.

• True

• False

A skydiver jumps out of a plane. He falls downward at a very fast speed. When he opens his parachute, he slows down. He falls at a safer speed until he lands. What force pulled the skydiver to the ground?

• air pushing

• air resistance

• gravity

• parachute pulling

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Imagine that there was suddenly no gravity on Earth. What would most likely happen to a picture hanging on a nail on the wall?

• You would see the picture float off the nail.

• You would not be able to get the picture off the nail.

• You would see the picture fall to the floor.

• You would see the picture shoot upward.

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Two scientists are studying how gravity affects objects in different cities. One scientist finds that a baseball drops to the ground in 5 seconds. The other scientist finds the same thing in her city. Why is it important for these scientists to share their findings?

• to help them change their data to match

• to learn from each other

• to stop worrying about gravity’s affects and go on to a new experiment

• to give them a reason to visit another city

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True or false:

Gravity is a type of force.

• True

• False

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