20. 1 Section Check Question 1 What is the continental shelf? The continental shelf is the gradually sloping end of a continent that extends under the ocean. Answer
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22. 1 Section Check Answer The answer is B. The other features lie beyond the continental slope.
23. 1 Section Check Question 3 What is the area in an ocean basin where new ocean floor is forming? Answer New seafloor forms at mid-ocean ridges as lava erupts through cracks in Earth’s crust. NC: 3.03
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55. 2 Section Check Answer The answer is A. The energy source for photosynthesis is the Sun. NC: 3.03
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57. 2 Section Check Answer The answer is C. Nekton include all swimming forms of fish and animals. NC: 3.03, 304
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59. 2 Section Check Answer The answer is C. Alluvial fans and deltas are sediment deposits. NC: 3.03
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78. 3 Section Check Question 1 What is pollution? Answer The introduction of harmful waste products, chemicals or other substances not native to an environment is pollution. NC: 3.05, 3.07, 3.08
79. 3 Section Check Question 2 What are the four main ways that pollutants from land reach the ocean? NC: 3.05, 3.07, 3.08
80. 3 Section Check Answer The ways pollutants reach the ocean are deliberate dumping, accidental spillage, rain, and runoff. NC: 3.05, 3.07, 3.08
81. 3 Section Check Question 3 How can sediment act as a pollutant? Answer When excess soil washes into streams, it can cause large amounts of silt to accumulate in coastal areas, destroying the habitats of various organisms. NC: 3.04, 3.05, 3.07, 3.08
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