Download Oceans: How We Use the Seas (Our Fragile Planet) by Dana Desonie PDF

By Dana Desonie

Earth's seas play an important function within the planet's platforms: Ocean currents move water and warmth around the world, and ocean ecosystems are one of the so much biologically effective anyplace. however the oceans are being abused. Wild fisheries are harvested to the purpose of cave in, and a few aquaculture damages lifestyles and the surroundings. humans deliberately or inadvertently unload wastes - sewage, oil, poisonous chemical substances, detergents, fertilizers, and invasive species - and all have an effect on ocean ecosystems. providing full-color pictures and illustrations and attractive textual content, "Oceans" introduces younger technological know-how scholars to those pressing matters. this crucial new paintings indicates how holding the oceans calls for conserving the full planet, and describes the significance of atmosphere apart marine reserves to save lots of important ecosystems.

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Extra info for Oceans: How We Use the Seas (Our Fragile Planet)

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Once there, it sinks and begin its journey around the globe again. The global ocean current system is 25 26 oceans Global ocean circulation with major surface water movements shown in red and deep water currents shown in blue. known as the great ocean conveyor. A single water molecule will make the complete circuit around the ocean in about 1,600 ­years. Waves Local winds, such as those generated by storms, create waves. Once formed, waves travel far from their place of origin, even without wind to push them.

Octopuses have an internal shell; they like to live alone, hiding behind rocks and in cracks. To avoid predators, octopuses can change color for camou-­ flage or can change shape to fit into tiny spaces. When hiding does not work, the animals squirt black ink to distract predators while they escape. The 65-foot (20 m) long giant squid has 10 arms, two that are long, thin tentacles with suckers. Squid can change color or can bio-­ luminesce when necessary. Many have bioluminescent lures to attract prey and use ink to confuse ­predators.

The most abundant fish are the ­herring-­type fish, which include sar-­ dines, anchovies, menhaden, and herring. These small fish feed on zooplankton and are food for other, larger fish, including mackerel, swordfish, and ­tuna. Marine ­Birds Marine birds inhabit the air and sea. Some live on land while others come ashore only to nest. 5 m) wingspan, spends four to five years at sea before it is old enough to reproduce. Some marine birds migrate thousands of miles between their feeding area and nesting grounds.

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