Manganese nodules are small, darkly colored lumps strewn across large areas of the ocean basins.
Deep-Water Deposits 1 The Seafloor
These nodules are rich in manganese, copper, iron, nickel, and cobalt, which are used the manufacture of steel, paint, and batteries.
Most of the nodules lie thousands of meters deep in the ocean and are not currently being mined.
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
1 Section Check Question 2 Which structure extends from the outer edge of the continental shelf to the ocean floor?
A. abyssal plain
B. continental slope
C. oceanic trench
1 Section Check Answer The answer is B. The other features lie beyond the continental slope.
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
You can help by disposing of wastes properly and volunteering for beach or community cleanups.
3 Ocean Pollution
You can recycle materials such as
newspapers, glass, and plastics and never dump chemicals like oil or paint onto soil or into water.
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
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
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
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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