The fundamental silicon-oxygen compound is silicon dioxide, which is also called ______________
Fill in the blank(s) with correct word
silica, or quartz
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The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid, water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. All of the other choices are correct.
The most abundant gas in Earth's atmosphere is oxygen
Indicate whether the statement is true or false
Some recent evidence points to the possibility of there being some liquid water on Mars "recently." Why does this puzzle astronomers?
A. Currently Mars is too hot for liquid water. B. The Martian atmosphere is too cold and has too low a pressure for liquid water. C. The Martian atmosphere is too thick, and clouds would form. D. All of these choices are correct.
Imagine that we launch a spaceship from the earth so its speed is 6 AU/y relative to the earth in the direction that the earth orbits the sun. This spaceship’s subsequent orbit around the sun is:
A. Circular B. Elliptical C. Parabolic D. Hyperbolic