Contour farming involves
A. converting a steep slope into a series of terraces.
B. building a series of small dams.
C. plowing and planting in rows across the slope rather than up and down.
D. plowing straight down-slope or straight up-slope.
E. stimulating the growth of soil bacteria.
Answer: C
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Why is the density of air greatest near sea level?
A. The force of gravity on air is greatest at Earth's surface. B. Air is warmest near sea level. C. Air is compressible. D. Air pressure is at a minimum near Earth's surface.
Fossils are useful in the study of historical geology for determining relative ages of strata,
depositional environments, and evidence for evolution. Indicate whether the statement is true or false.
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
The primary difference between tropical and middle-latitude forests is that middle-latitude forests have developed a mechanism to counteract:
a. long periods of sunlight b. long periods of high temperatures c. long periods of low humidity d. long periods of low temperatures and annual precipitation variations e. long periods of stormy weather