The temperature at which gaseous water condenses to form liquid water is called
A. the precipitation point
B. the sublimation point.
C. the relative humidity point.
D. the saturation point.
Answer: D
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The city of Houston was founded around the turn of the 20th century after ________
Fill in the blank(s) with correct word
Which of the following are single-celled, microscopic protozoans that build their hard shells out of silica?
A) Coccolithophores B) Copepods C) Ctenophores D) Foraminifers E) Radiolarians
Some older cars vibrate loudly when driving at particular speeds. For example, at 65 mph, the car may be most quiet, but at 60 mph, the car rattles uncomfortably. How is this analogous to the quantized energy levels of an electron in an atom?
A. The vibrating car is analogous to one of the energy levels of the electron, which is the point at which the electron experiences resonance. B. There can be no analogy between a vibrating car and the quantized energy level of an electron in an atom since electrons don't vibrate. Doing so would cause the atom to break apart. C. A car is designed for maximum performance at particular speeds under given road conditions. Likewise, electron energy level transitions are smooth if they occur while the atom is in a low energy state. Changing the speed of the car for the road conditions is similar to subjecting the atom to unusual energy conditions. D. New cars and small atoms don't share this behavior because modern technology produces better cars and small atoms don't have enough electrons to move among quantized energy levels to cause vibration.
Radioactive decay in the Earth, especially in the Earth's crust, creates a tremendous amount of
A. pressure. B. heat.