The inner planets are composed of rock and metal, and the outer planets are rich in low-density gases such as hydrogen and helium
a. True
b. False
Indicate whether the statement is true or false
True
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In the above H-R diagram sketch, which star is a blue giant?
A. A B. B C. C D. D E. E
How many constitutional isomers that are dibromoethanes exist?
a. 3 b. 4 c. 5 d. 2 e. 6
Force on a Moving Charge: A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A. upward B. northward C. southward D. eastward E. westward
Which of the following correctly describes what we mean by a great circle on the surface of Earth?
A) any circle of latitude B) any circle whose center is at the center of Earth C) any circle larger than 10,000 km in diameter D) a circle of longitude