Shoot a cannonball horizontally from a cannon at a mountain top and it crashes to Earth when fired at a speed of
A. 5 km/s.
B. 9 km/s.
C. 8 km/s.
D. all of the above
Answer: A
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The first primitive organisms on Earth came into existence approximately ________ years ago
A) 10,000 B) 550 million C) 3.8 billion D) 4.6 billion
Any bending of light other than by reflection or refraction is
A. dispersion. B. interference. C. diffraction. D. all of the above
The most explosive events to occur on the Sun are ________
A) solar flares B) solar winds C) umbras D) sunspots E) filaments
Color is not a reliable means for mineral identification because
A) minerals come in a variety of colors, and chemical impurities in the mineral can affect color. B) minerals can weather and change color. C) a mineral's powdered color is different than its solid color. D) there are so many colored minerals.