Air pressure:
A) constantly changes in order to avoid equilibrium.
B) is the force exerted in all directions by a column of air rising upward from the point of measurement.
C) is exerted downward only.
D) is independent of the force of gravity.
Answer: B
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Why is the formation of iron hydroxide, Fe(OH)2, from Fe2+ and OH- not considered an oxidation-reduction reaction?
A. The iron is only oxidized and nothing is reduced. B. The iron is only reduced, not oxidized. C. Iron can never be oxidized or reduced. D. The Fe2+ ion is not changed during this chemical reaction.
Thick layers of wind-blown silt are
A) loess. B) alluvium. C) rills. D) fluvium.
Why does acid rain result from fossil fuel consumption?
A) Fossil fuels heat the atmosphere, making rain more acidic. B) Fossil fuel burning releases nitrogen and sulfur oxides. C) Particulates emitted from fossil fuel burning settle in lakes and acidifies them. D) Fossil fuel burning releases stored organic carbon.
According to the International Labor Organization (ILO) of the UN, about 150 million people are employed in manufacturing around the world
Indicate whether the statement is true or false.