What is a hanging valley, and how does one form? What will be an ideal response?
A hanging valley forms from the eroded valley of a tributary valley glacier that met the trunk valley
glacier at an elevation high above the valley floor of the latter.
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Which one of the following items is a major disadvantage of animal feed lots?
a. Less land is required to feed the animals. b. Use of antibiotics can increase genetic resistance to microbes in humans. c. Soil erosion is reduced. d. Overgrazing is reduced. e. Biodiversity is protected.
Near the top of the World Bank's middle income group of countries, _____ has the highest GNI per capita in Middle America.
A. Mexico. B. Honduras. C. French Guiana. D. Costa Rica
________ is an example of a natural process that is accelerated by human activities.
A. Eutrophication B. The mobilization and concentration of soluble salts from groundwater C. The weathering and release of toxic inorganic minerals from rocks D. Sediment loading of rivers E. All of these are correct
When water enters a crack in a rock and subsequently freezes, it has the effect of ___
a) gluing the rock more tightly together b) making the rock harder c) sealing the crack thereby preventing further weathering d) widening the crack and hastening the rock's disintegration e) displacing surface acids that may weaken the rock