Describe the evolution of valleys. What will be an ideal response?
A valley starts to erode with a small rill. The rill collects more runoff and becomes deeper and wider,
downcutting when it has more energy than it needs to transport sediment. Lateral erosion, mass
wasting, sheet wash, and headward erosion all contribute to the evolution of valleys.
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At least half of the known species of terrestrial plants and animals are found in:
a. Temperate and tropical rainforests combined. b. Temperate rainforests only. c. Tropical rainforests only. d. Deciduous forests. e. They are evenly distributed amongst the biomes of Earth.
In which part of a northeastward-moving thunderstorm does a tornado most likely develop?
A. southwest part B. northeast part C. southeast part D. northwest part
Due to the lack of chemical weathering, there is a great deal of clay-sized sediment in desert areas
Indicate whether this statement is true or false.
Acid precipitation
A. has been significantly reduced in the United States. B. impairs the ability of aquatic organisms to get calcium for skeleton production. C. affects aquatic ecosystems by lowering the pH of the water. D. All options are correct.