Which terrestrial planet likely has the thickest lithosphere relative to the planet size?
a. Mercury
b. Venus
c. Earth
e. Mars
Answer : a. Mercury
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Most of Earth's fresh water is in
a. the atmosphere. b. lakes and rivers. c. glacial ice sheets. d. aquifers.
An O-star has a hotter surface temperature than the Sun. Therefore, compared to the Sun,
A) its emission peaks in the infrared part of the spectrum. B) its emission peaks in the blue part of the spectrum. C) it emits at about the same wavelengths as the Sun (similar peak) but it is much brighter. D) it emits at about the same wavelengths as the Sun (similar peak) but it is much fainter.
When the reflection of an object is seen in a concave mirror the image will
a. always be real. b. always be virtual. c. may be either real or virtual. d. will always be enlarged.
A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same. b. It goes up. c. It goes down. d. More information is needed to reach a conclusion.