I. Choose the letter of the correct answer

____21. Which of these planets has the longest day?

a. Earth b. Jupiter c. Mars d. Saturn

____22. Which of these is true about the members of the solar system?

a. They are fixed in their own places. b. They have their own light.

c. They moved around the sun. d. They have all satellite.

____23. Which of the following describes Saturn and Jupiter?

a. They are made up of gases. b. They are made up of rocks.

c. They are sources of energy. d. They have rings around it.

____24. Which causes day and night in the planets?

a. Temperature c. Rotation

b. Distance from the sun d. Revolution

____25. One complete turn of earth around the sun is equal to____.

a. a year b. a day c. a week d. a minute

____26. Why is Neptune considered the farthest planet?

A. It is a gas giant. B. It is very close to the Sun.

C. It moves faster than all other planets. D. Its orbit is bigger than that of Uranus.

____27. What planets are all made up of gases?

A. Mercury, Venus, Earth, and Mars B. Venus, Mars, Saturn, and Pluto

C. Mars, Jupiter, Saturn, and Uranus D. Jupiter, Saturn, Uranus, and Neptune

____28. What is the estimated radius of our planet?

A. 2,440 kilometers B. 3, 390 kilometers

C. 6, 371 kilometers D. 24, 622 kilometers

____29. Why is Mars called the red planet?

A. It has polar ice caps. B. Its atmosphere is red.

C. It has volcanoes that erupt consistently. D. Its soils and rocks are made mostly of iron oxide.

____30. Which of the statements below does not describe Venus?

A. Its surface has craters and is covered by lava. B. It is the second planet closest to the Sun.

C. It is visible in the sky in the early morning or evening. D. It has winds that are the strongest in the solar system.
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