What causes the changing dark and light features visible on the Martian surface from Earth?
A) seasonal growth of vegetation
B) the flooding of the network of canals from seasonal polar ice melting
C) lava fields, similar to those found on the Moon
D) highly cratered and eroded areas that are frequently covered and uncovered by dust
E) huge storms like those on Jupiter with winds that often reach speeds of hundreds of kilometers per hour
D
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In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?
a. zero b. 45° c. 90° d. 180°
Resistance
a) is measured in amperes. b) is the opposition to the flow of electric current. c) is the driving force that moves electrons in conductors. d) is not affected by temperature changes.
Light takes approximately one second to travel from Earth to the Moon. This means that the Moon is approximately
A) 1 astronomical unit from Earth. B) 1 light-year from Earth. C) 3000 kilometers from Earth. D) 300,000 kilometers from Earth. E) near the top of Earth's atmosphere.
The laws of physics, chemistry, and geology have operated unchanged through time to shape Earth as we know it today. This statement can be summed up by the idea of
A) evolution. B) everlasting change. C) uniformitarianism. D) natural history.