Read e-book online Renewing Earth's Waters (Environment at Risk) PDF

By Christine Petersen

ISBN-10: 0761440046

ISBN-13: 9780761440048

In setting in danger medical rules, techniques, and methodologies in environmental technology are explored and defined.

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The two-year cycle was problematic because it did not give states enough time to monitor all of their waters. S. EPA advocated a 46 The Clean Water Act new approach. States now have five years to complete their 305(b) reports—but in that time, they are expected to monitor all bodies of water within their jurisdictions. Yearly progress reports are also expected so the EPA and the public can remain informed between NWQI reports. States must also prepare a Section 303(d) list of Threatened and Impaired Waters.

A kelp forest grows to great heights in the sunlit waters off the California coast. 34 Healthy Aquatic Ecosystems usually near coastlines. Polyps obtain calcium from seawater and use it to construct a hard exoskeleton. Because the animals live in huge colonies, they build large, hard structures on the sea floor. Coral reefs are beautifully colored, though coral polyps themselves are white. This is because corals have a symbiotic relationship with algae, which live in their bodies. The algae photosynthesize, giving off oxygen that the corals need for respiration.

As algae die, they create a food source for bacteria. Large bacterial populations use most of the oxygen in the water, which results in zones of low or zero oxygen in the water, called hypoxic zones. Fish and other aquatic organisms require dissolved oxygen to survive, just as organisms on land breathe oxygen from the air. Under hypoxic conditions, 62 Our Impact on Water This satellite image of the “Dead Zone” in the Gulf of Mexico shows the red and orange areas that represent high concentrations of algae and other plankton and river sediment extending from the mouth of the Mississippi River.

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Renewing Earth's Waters (Environment at Risk) by Christine Petersen


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