Thursday, March 3, 2016

The Earth

Earth's relationship with Sun

The Earth is the third planet from the Sun, with Mercury and Venus being closer. Its unique position gives the Earth a temperate climate, allowing the chemical reactions necessary to sustain life. But over the years, the climate has varied enough to melt the ice caps near the North and South poles, or to cause glaciers to move south in an Ice Age.

Revolves around the Sun in an orbit

The Earth goes around the Sun in a counterclockwise orbit, taking a year or about 365 days to make one revolution. The orbit is an ellipse, so the Sun is slightly off-center.

The Earth orbits the Sun

The average distance from the Sun is 149,597,890 kilometers (92,955,820 miles). This distance is so great that it takes light about 8 minutes to reach the Earth from the Sun.

Spins on its axis

The Earth spins or rotates on its axis in a counterclockwise motion, as viewed from above the North Pole. It makes one revolution in 24 hours.

The spinning of the Earth on its axis is what causes the Sun to appear to move across the sky. The effect the apparent movement of the Sun is similar to looking out the window of a moving car, where things outside appear to be moving past you.

Tilt affects seasons

The Earth's axis also tilts with respect to the Sun, causing the changes of the seasons. In summer, the Earth is tilted such that the Sun falls more directly, while in winter the Sun looks lower in the horizon and the light comes at a glancing angle. The tilt of the Earth also causes the summer days to be longer than the nights. In winter the days are shorter and there is less light to heat the ground.

In my opinion Earth is so important because we live in there so we have to take care of it, actually there's a lot of pollution that affects atmosphere and destroyes ozone cap a solar radiation affect people.


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