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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Any bending of light other than by reflection or refraction is
A. dispersion. B. interference. C. diffraction. D. all of the above
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.
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
The most explosive events to occur on the Sun are ________
A) solar flares B) solar winds C) umbras D) sunspots E) filaments