What conditions during the formation of coal may reduce its quality for industrial use?
A) Very high heat and pressure are applied.
B) Clay and silt wash periodically through the swamp that formed the coal.
C) The swamp that formed the coal floods.
D) The coal is formed of mostly green plants and contains very few woody trees.
Answer: B
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It is theorized that a pulsar only emits X-rays and visible light during its early history. What do you suppose is the basis of this theory?
A. As the pulsar's energy dissipates, the frequency of the energy it emits drops. B. X-rays are likely the result of radioactive decay, which only can occur in a pulsar's early history. C. The pulsar's high rate of spin produces a magnetic field that, over time, slows the pulsar down. D. X-rays and visible light are both part of the electromagnetic spectrum.
Greeks had moved into Europe by
A. 2500 B.C. B. 2000 B.C. C. 1500 B.C. D. 1000 B.C
To make a decision about the stability of the air, what is the most important information that you need to know beyond the temperature and dew point of the rising parcel?
What will be an ideal response?
A hot rock deep in Earth may melt if it is subjected to an increase in pressure
a. True b. False