What type of coal is the most common in the United States?
A. Anthracite
B. Lignite
C. Bituminous
D. Subbituminous
Answer: C
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The principal gases of the homosphere (by volume) are nitrogen, helium, and argon
Indicate whether the statement is true or false
The balanced equation N2(g) + 2 O2(g) ? 2 NO2(g) means which of the following?
A) One mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide. B) One gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. C) The equation means both a and b. D) The equation means neither a nor b.
An echo sounder operates by measuring the time required for a ________
A) sound pulse travels from a ship to the seafloor and back B) radar beam to travel from a harbor patrol boat to a fuzz-buster on a speeding yacht C) light beam to travel from a satellite at a known altitude to the sea bottom and back D) radar beam to travel from a ship to the seafloor and back
Which of the following is incorrect regarding the spatial-temporal variability of net primary productivity?
A) Nutrient levels in oceans affect productivity. B) Productivity rates in deserts is much less than that of tropical regions. C) At temperate and high latitudes, the rate of carbon fixing is seasonally variable. D) Net primary productivity is highest in the winter in the midlatitudes and high latitudes. E) Productivity rates are constantly high throughout the year in the tropics.