The first person to claim to see linear features on the surface of Mars was
A) Angelo Secchi
B) Percival Lowell
C) Giovanni Schiaparelli
D) William Herschel
C
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The great variety of igneous rocks is due to _______.
Fill in the blank(s) with the appropriate word(s)
Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water B) slightly cooler, but still above freezing C) slightly warmer, but still well below the boiling point of water D) about the same as it is now
A simple electrical circuit has a constant voltage power supply and a variable resistor as a circuit. As you increase the resistance the current flow _______________
Fill in the blank(s) with correct word
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A) positive B) negative C) The particle could be either positive or negative. D) None of the above choices is correct.