________ averages roughly 7 km thick
Fill in the blank(s) with correct word
Oceanic crust
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Which of the following solutions is the most acidic?
A. a solution with a pH = 10 B. a solution with a pH = 7 C. a solution with a pH = 4 D. a solution with a pH = 14 E. All of the solutions are basic.
What role do fungi play in the formation of fertile soil?
A) They are a source of minerals. B) They carry out chemical reactions that convert carbon dioxide to nitrogen. C) They decompose organic material into compounds plants can use. D) They add air to soil.
Ecosystem services are often classified into four different categories that include provisioning services (supplying us with food, air, and water), as well as ________
A) regulating, cultural, and supporting services B) aesthetic, spiritual, and recreational services. C) aesthetic, cultural, and sustainable services D) regulating, sustainable, and homeostatic services E) aesthetic, ecological, and regulating services
Much of the biosolids material that is the end product of a water treatment plant is ________
A) loaded onto barges and sent to underdeveloped countries to use as fertilizer B) used as crop fertilizer in the United States C) placed in deep injection wells to keep it out of the water table D) trucked to special biohazard landfills for disposal E) used as part of the "fill" to develop wetlands into agriculture or housing areas