One of the main roles of plants in biogeochemical cycles is to
A) reduce the rate of weathering.
B) decrease the amount of time that water remains in contact with rocks and soils.
C) extract carbon dioxide from the atmosphere.
D) harden the soils.
C) extract carbon dioxide from the atmosphere.
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Which of the following describes the Fata Morgana?
A. sundog B. ice-crystal cloud C. rainbow D. mirage
Clay minerals are sheet silicates with flat surfaces that are ________ charged and attract ________.
A. negatively; water molecules B. neutrally; other clay minerals C. negatively; nitrogen gas D. positively; insects E. positively; carbonic acid
An air parcel is considered unstable when it
A) either remains as it is, or changes its initial position. B) continues to rise until it reaches an altitude at which the surrounding air has a similar temperature. C) it resists displacement upward. D) it ceases to ascend.
A good air mass source region is generally flat and of uniform composition with light surface winds
a. True b. False