Which statement about water is true?
A. Water exists as a liquid over a wide temperature range.
B. Water compresses when it freezes.
C. Water filters out nearly all UV radiation.
D. Water evaporates with very little energy.
E. Liquid water is typically not a good solvent.
Answer: A
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Matter is best described as
a. anything that has mass and occupies space b. something that has the capacity to do work c. something that can exist as a solid, liquid, or gas d. something that can produce change e. is anything that has mass and occupies space and can exist as a solid, liquid, or gas
What percent of the world's power is generated from renewable sources?
A) 20% B) 10% C) 3% D) 5% E) 7%
________ is home to 20 percent of the world's mangrove forests
A) Laos B) Burma C) East Timor D) Indonesia
The basic idea behind the planetesimal hypothesis is that
A) planets form as a direct result of the nuclear fusion of nebular gases and planetesimals. B) small grains of cosmic dust and other solids gradual accrete to form planetesimals that may grow to become protoplanets and eventually planets. C) early in the solar system's history, a star passed near to the Sun and pulled off gases that eventually condensed to form planets. D) planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart, thereby creating smaller objects—the planets.