Final Exam EL

What effect would an invasive species have on the biodiversity in an ecosystem?

• The survival rate of native species would improve.

• The invasive species would compete with native species and prevent them from flourishing.

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What effect does low biodiversity have on an ecosystem?

• It creates lower genetic variation and causes an ecosystem to be more vulnerable to disease.

• It creates greater genetic variation and causes an ecosystem to be less vulnerable to disease.

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Which activity causes the least amount of wetland and estuary degradation when it occurs near the coast?

• dune grass rehabilitation

• agricultural development

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At which location along a river or stream would the greatest rate of erosion most likely occur?

• at its origin

• at its steepest incline

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What will most likely happen if a dam is built on a major river system?

• Animal biodiversity will decrease because migration patterns will be blocked by the dam.

• The dam will decrease the flow of the river, causing flooding to increase downstream.

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This map shows global deepwater ocean currents beginning in the North Atlantic Ocean. The currents flow south to the ends of South America and Africa, traveling into the Pacific Ocean or the Indian Ocean.

Which statement explains the behavior of global deepwater ocean currents?

• In the North Atlantic, the cold current sinks because of its increasing density. In the Indian Ocean, the warm current rises because of its decreasing density.

• In the North Atlantic, the cold current sinks because of its decreasing density. In the Indian Ocean, the cold current rises because of its increasing density.

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How is weather different from climate?

• Weather focuses on short-term changes to the atmosphere, while climate focuses on long-term changes.

• Weather is the average climate for a particular region.

Why do most commercial airplanes fly in the lower stratosphere rather than in the troposphere?

• because the lower stratosphere is less turbulent than the troposphere

• because the lower stratosphere has less ozone than the troposphere

Why is only a portion of the sun’s electromagnetic radiation that is directed toward Earth able to reach Earth’s surface?

• The atmosphere of Earth filters a portion of the radiation.

• The gravitational pull of the sun prevents the release of a portion of the radiation.

Which statement describes the revolution of the moon and Earth around a barycenter?

• Earth revolves around the moon, while the moon remains stationary.

• The moon and Earth revolve around their common center of gravity.

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