The quality of water can be measured using which of the following ways:
A. parts per million (ppm) and parts per billion (ppb)
B. total dissolved solids (TDS)
C. pH
D. All the choices are correct.
Answer: D
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Discuss the reasons for the so-called “Cambrian Explosion.” What factors were important in this
change in apparent fossil populations? Give examples of some of the organisms that lived during this time. What will be an ideal response?
The recovery of acidic lakes in the northeastern United States and eastern Canada is largely the result of
A) the buffering effects of the granite rock in these regions. B) the widespread addition of limestone to the lakes in these regions. C) the elimination of lead from gasoline sold in North America. D) reductions in sulfur dioxide and nitrogen oxide pollution.
The Earth's tallest trees are the
A) coast douglas fir (Pseudotsunga menziessii). B) coast redwoods (Sequoia sempervirens). C) giant ash (Eucalyptus regnans). D) sitka spruce (Picea sitchensis).
The dew-point temperature occurs when relative humidity is approximately 80-85%
Indicate whether the statement is true or false