Download Chick (See How They Grow) by DK Publishing PDF

By DK Publishing

A photographic paperback sequence designed to introduce the interesting international of animals and the way they enhance. during this informative and hugely visible sequence, attractive step by step images permits teenagers to work out a butterfly emerge from its cocoon and unfold its wings, or see what occurs whilst an egg hatches and a chick emerges. every one booklet comes with a decal sheet filled with lovable photos of the animals featured within the booklet.

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Extra resources for Chick (See How They Grow)

Sample text

Still, wave energy has plenty of potential. 5–6m) close to the coast. In these regions the waves are potent enough to make wave power plants a realistic possibility. South Africa, Australia, Scotland, and the United States, for example, all have long sections of shoreline where wave power plants make good sense. ”43 Given that this coast is more than 1,000 miles (600km) long, the total potential power generation is enormous. As with tides, there are various ways of capturing wave energy. A corporation called Ocean Power Technologies, for example, has developed a device known as a PowerBuoy.

Caused mainly by the gravitational pull of the moon, tides cause regular and predictable changes in the level of the ocean. The height difference between the high and low tides in any given place is known as the tidal range. 1% of the energy range is negligible; the high tide may be in the oceans, we could no more than 10 or 12 inches (25 to support the energy needs 30cm) above the low tide. ”40 of the world, however, the tidal range is —Michael Bernitsas, energy researcher. considerably larger.

To date, the costs associated with ocean power are far higher than the costs for other fuels—including solar, wind, and traditional hydropower as well as fossil fuels like oil and natural gas. That is a strong incentive for business leaders and governments to invest in these other energies rather than in trying to tap the waves, tides, and currents. The cost disparity between ocean power and other forms of energy is not as great as it once was. Still, it remains significant. A 2010 study found that generating power from the ocean waves was about five times more expensive than producing the same amount of energy from the wind.

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