________ are human-made lakes and reservoirs that store water for irrigation, flood control, or energy generation
A) Watersheds
B) Levees
C) Aquifers
D) Impoundments
E) Channels
D
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Care and proper management of the world's biomes are necessary to maintain sustainability. However, some ecosystems are in better condition than others. Which one of the following regions appears to be healthiest and best managed today?
A) Tropical forests in South America B) Forests in the United States C) Coral reefs throughout the world D) Mangroves in southeast Asia
Tornadoes typically form with: a. strong vertical wind shear
b. a conditionally unstable environment. c. severe thunderstorms. d. All of these choices.
Explain how an aurora is produced
What will be an ideal response?
Match the causes of soil erosion with the soil conservation practice intended to reduce that erosion.Slope of the land surface:
A. Keep soil covered B. Contour plowing C. Provide shelter for fields D. Return organic matter to soil