The albedo of the Earth's surface is about 4 percent, yet the combined albedo of the Earth and the atmosphere is about 30 percent. Which of the following conditions BEST explains why this is the case?
A. low albedo of clouds, low albedo of water
B. high albedo of clouds, low albedo of water
C. low albedo of clouds, high albedo of water
D. high albedo of clouds, high albedo of water
Answer: B
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Which of the following statements is true about biomass plantations that produce biofuels?
A. The claim that they reduce greenhouse gases is debatable. B. They have reduced the price of food. C. They are sustainable. D. The biofuels produced by them can replace all the gasoline we now use.
While the Native Americans fell victim to European diseases, including smallpox, influenza, measles, and typhus, Europeans contracted syphilis from the Native Americans
Indicate whether the statement is true or false.
Because of unconformities, the geologic record at any given location is incomplete. In other words, no one locality on Earth can provide a complete record of our planet's history.
a. true b. false
A ________ grid communicates between users and utilities to increase energy efficiency
A) green B) renewable C) metered D) power E) smart