Climates of the World
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Transcript of Climates of the World
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Climates of the WorldSection 1
2.5 relate major climate and vegetation regions of the world
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• The sun, the brightest star in our sky, is a major factor in creating Earth’s climates. The sun, composed of hydrogen, helium, and other gases, rotates on an axis at about the same angle as the earth’s axis. Only a tiny fraction of the power generated by the sun reaches the earth.
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Sun video
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Climate and Weather• Weather is the condition of the atmosphere in a certain place at a specific time.
• The climate of an area is its long-term typical weather pattern.
• The climate of an area is determined by many things; the most important is the earth’s position in relation to the sun.
2.6 describe factors that influence climate regions
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Weather & climateVideo
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Earth’s Tilt and Rotation
• Earth is currently tilted at an angle of about 23½°. Because of the tilt of this axis, not all places on Earth receive the same amount of direct sunlight at the same time.
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Earth’s Revolution
• Earth travels in an orbit around the sun, completing one trip about every 365 days.
• The seasons are caused by the earth’s revolution around the sun and the earth’s tilt.
• The Equator divides Earth into the Northern and Southern Hemispheres. When one hemisphere experiences winter, the other experiences summer.
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Tilt video
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The Tropics of Cancer and Capricorn
• The line of latitude at 23½°N is called the Tropic of Cancer–the northernmost latitude on the earth to receive the sun’s direct rays.
• The line of latitude at 23½°S is called the Tropic of Capricorn–the southernmost latitude to receive the sun’s direct rays.
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The Poles
• The North Pole and the South Pole are located at either end of the earth’s axis.
• Each Pole receives continuous indirect sunlight six months each year.
• While one receives continuous sunlight, the other receives little to no sunlight.
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South pole video
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The Greenhouse Effect• Part of the sun’s radiation passes through
Earth’s atmosphere.• Like the glass in a greenhouse, the
atmosphere keeps the heat from escaping back into space too quickly.
• Humans have altered Earth’s atmosphere by burning fuels that release carbon dioxide and other greenhouse gases into the atmosphere.
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Greenhouse video