Answer the following question given this paragraph:   On a contour map, a circle with inward hatches indicates a depression.   Q: What topographic feature does a circle with inward hatches represent on a contour map?   Choices:  - a lake  - vegetation  - a mountain  - a depression  A:
a depression

Answer the following question given this paragraph:   Evolution occurs in a population when allele frequencies change over time. What causes allele frequencies to change? That question was answered by Godfrey Hardy and Wilhelm Weinberg in 1908.   Q: What kind of change causes evolution in population?   Choices:  - morphogenesis frequency changes  - paragenic frequency changes  - transgenic frequency changes  - allele frequency changes  A:
allele frequency changes

Answer the following question given this paragraph:   Temperature increases with altitude in the thermosphere. Surprisingly, it may be higher than 1000° C (1800° F) near the top of this layer! The Sun’s energy there is very strong. The molecules absorb the Sun’s energy and are heated up. But there are so few gas molecules that the air still feels very cold. Molecules in the thermosphere gain or lose electrons. They then become charged particles called ions.   Q: As altitude rises, what happens to the temperature in the thermosphere?   Choices:  - oxygen increases  - oxygen decreases  - temperature decreases  - temperature increases  A:
