Sand dunes form as wind
A) disperses sand.
B) blows sand from the back to the front of the dune.
C) blows sand from the front to the back of the dune.
D) interrupts the normal sequence of deposition.
Answer: B
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The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere is the temperature of the sun the smallest?
a. 1000 km
b. 2300 km
c. 2500 km to 4000 km
d. 500 km
e. a and c
A __________ lens is thicker at the center than the edges
Fill in the blank(s) with correct word
At which of the following temperatures would one liter of water weigh the most?
a. 2°C b. 4°C c. 8°C d. 90°C e. It would weigh the same at all these temperatures.
The temperature of a quantity of ideal gas in a sealed container is increased from 0°C to 819°C. What happens to the speed of the molecules with average kinetic energy of the gas as a result of this temperature increase?
a. It does not change since this speed is independent of temperature. b. It increases but it is less than double the original speed. c. It doubles. d. It quadruples.