Use the graph below to answer this question. One point represents basalt, one andesite and one rhyolite.
Which point on the graph is most likely to form basalt?
A. Point a
B. Point b
C. Point c
Answer: A
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Color is not a reliable means for mineral identification because
A) minerals come in a variety of colors, and chemical impurities in the mineral can affect color. B) minerals can weather and change color. C) a mineral's powdered color is different than its solid color. D) there are so many colored minerals.
A seismic station records an earthquake that has a maximum surface wave amplitude of 20 mm and the S-wave arrives 40 seconds after the P-wave. The Richter magnitude of this earthquake is
A) 4.5. B) 5. C) 5.5. D) 6.
Which of the following volcanic hazards can be expected to affect areas at the greatest distance from the vent?
a. pyroclastic flows b. lava flows c. debris avalanches d. lahars
Most of the ionosphere is found in what atmospheric layer?
a. Troposphere b. Stratosphere c. Mesosphere d. Thermosphere e. homosphere