The daily motion of celestial objects in the sky is caused by
A) the rotation of our planet about its axis.
B) the revolution of our planet around the Sun.
C) the movement of our planet within the Milky Way.
D) the tilt of Earth's axis.
Answer: A
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Which of the solar system objects listed below is most similar to Earth in terms of mass and density?
a. Mercury b. Moon c. Venus d. Mars e. Deimos
Look carefully at this map and the two labeled paths from Philadelphia to Beijing. Which statement is true?
A) The map is fine, and the distances seem backward only because it is a flat map of a round Earth. B) The distances on the two paths are labeled backward; the curved one should be the longer one. C) The upper curved path makes sense only if we assume that it is a path that is drilled through the center of our planet. D) The routes shown are impossible because there can be only one correct distance between two cities.
An object in uniform circular motion has
a. constant acceleration. b. variable radial distances. c. constant velocity. d. constant speed.
Explain why leaves and plants are the colors they are, not black or white
What will be an ideal response?