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The science that deals with the physical aspects of the earth is called _____.
The history of the earth has been divided by scientists into eras. Which of the following shows the arrangement of these eras the proper sequence from the oldest to the most recent?
All the planets in the solar system _____.
Johannes Kepler developed three basic laws of planetary motion. Which of the following is not one of these laws?
Which scientist paved the way for modern exploration by advancing the theory that planets revolve around the sun?
The star, Alpha Centauri, which is considered as the closest star to our solar system is about 4.7 light years away from the earth. If the start emits a beam of light, how long will it take the light to reach the earth?
Which of the following is the main cause of seasonal changes?
The vernal equinox is the time at which the sun passes through this point, about March 21, marking the beginning of what season in the northern hemisphere?
The earth’s rotation on its axis gave rise to the occurrence of day and night. What would have happened if the earth’s axis is not tilted?
When the arctic circle is experiencing 24 hours of darkness, the sun is shining directly over the _____.