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240 Climate and biomes - Climate and biomes Agriculture and...

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Climate and biomes Agriculture and the Mediterranean Biome
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Day length Because the Earth is tilted on its axis relative to the plane of movement around the sun, it works like a gyroscope pointing always in the same direction. In winter the Northern hemisphere points to the sun, but on the other side of the cycle (in winter) the Northern hemisphere points in the same direction and so away from the sun. Hence shorter and longer days.
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Water Two Hs and one O is so light it should be vapor at ambient temperatures. Hydrogen can swing both ways (give up an electron to get down to zero or add an electron to reach 2 in the outer shell like Helium). Hydrogen in water does both. This results in strong bonds in H 2 O but weak hydrogen bonds between molecules. Water is thus a loose polymer. High surface tension Very high latent heat (from melting to ready to boil takes 100 calories. It takes 5 ½ times that heat to make water at 100 0 C turn into steam at 100 0 C. Without hydrogen bonds there would be no rain (droplets could not hold together) or erosion (waves could not form) without water’s macromolecular structure.
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