The presence within the environment of a chemical or other agent at a level that is harmful to humans or other organisms is ____________________.
Fill in the blank(s) with the appropriate word(s).
pollution
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Hydrogen sulfide, H2S, burns in the presence of oxygen, O2, to produce water, H2O, and sulfur dioxide, SO2. Through this reaction, is sulfur oxidized or reduced? 2 H2S + 3 O2 ? 2 H2O + 2 SO2
A. Sulfur is oxidized. B. Sulfur is both oxidized and reduced. C. Sulfur is reduced. D. Sulfur is neither oxidized nor reduced.
A change in the acidity of mountain lakes would most likely be a result of
(1) ecological succession of the area at the top of the mountain (2) the introduction of new species into the lakes (3) air pollution from smoke stacks miles away (4) planting grasses and shrubs around the lakes
Which of the following is NOT true of shield volcanoes?
A) They include the Big Island of Hawaii. B) They are known for their violent, exploding eruptions of thick and gassy magma. C) They are the largest volcanoes on Earth. D) They have runny basaltic lava.
In the tropics, the noon sun is always high in the sky; therefore, diurnal and seasonal changes in temperature are small
Indicate whether the statement is true or false