Essay on earth is a unique planet

We're the third rock from the sun

The large amount of water on the Earth could create problems, though. If something is heated, it expands, and when cooled, contracts. Thus, given two objects of the same size and material, if one is cooler, it will be heavier. This may not seem like a problem, but in the case of water, it would be, if it were not for a rare anomaly.

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If water continued to contract when cooled, it would become heavier and thus sink to the bottom of the ocean. Further, when water turned to ice, it would likewise sink to the bottom of the ocean. One result of this is that the ocean bottom would be extremely cold—and many fish would die. In time, more and more of the ocean would become ice as more froze on the surface, sank, and accumulated at the bottom.

Thus, for much of the Earth, the ice that forms in seas, oceans, and lakes stays near the surface where the sun and the warm water below melts it in the summer. This process of surface water warming and sinking to the bottom, plus the Coriolis effect produces ocean currents. These currents, among other things, insure that most of the ocean stays in a liquid form.

Planet Earth facts and information

Indeed, "The Lord by wisdom hath founded the earth; by understanding hath He established the heavens. On the land, the opposite happens.

How Unique is the Earth?

Air, after it is warmed, rises—and the air close to the surface of the Earth is heated via light energy from the sun. The air near the surface then rises upward. The result is that the air near the Earth's surface maintains a temperature in which life can exist. If air acted the same way that water did, the temperature on the Earth's surface would be unbearable—and life could not survive for very long.

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The temperature a few hundred feet above the surface, on the other hand, would be quite cold and, likewise, life could also not exist there. The only habitable region would be a thin slice of air, but even here life could not exist for long.

The Reason Why Earth Can Sustain Life

Plants and trees which would be necessary to support the life in the atmosphere could not survive as they would be in the cold zone. Thus birds would have no resting place, or food, water or oxygen. But air rises when heated and thus life can exist on the Earth. The movement of warm air from the surface rising upward creates air currents wind which are an important part of the Earth's ecological system.

They carry away carbon dioxide from areas which overproduce, such as cities, and move oxygen to areas in need of it, as large urban population centers.

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The mixture of gases usually found in the atmosphere, without man's pollution, is perfect for life. If it were much different more oxygen, less carbon dioxide, etc. If our atmosphere were thinner, many of the millions of meteors which now are burned up would reach the Earth's surface, causing death, destruction and fires everywhere. If evolution works to evolve life to fit the existing environments, why has it not equally conquered all of the environments here and elsewhere?

Earth is far better suited for life than any other planet, yet most of the environments even here, are either too hot or too cold, too far underground or too far above ground to support much life.

Earth Statistics:

In the several thousands of miles of changing environments from the center of the Earth to the edge of its atmosphere, there are only a few feet of habitable environment, and therefore almost all creatures are forced to live there. Today, thanks to visiting spacecraft, we know that the planet's appearance is due to rust in the Martian rocks.

Mars is the fourth planet from the Sun. It orbits the Sun at an average distance of million km, half as far again as the Earth, so human visitors would find it very cold. Although summers near the equator can be quite warm, the average temperature is 63 degrees Celsius below zero - similar to winters in Antarctica. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3, miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of monikers. Earth orbits the sun once every Since our calendar years have only days, we add an extra leap day every four years to account for the difference.

Though we can't feel it, Earth zooms through its orbit at an average velocity of During this circuit, our planet is an average of 93 million miles away from the sun, a distance that takes light about eight minutes to traverse.

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Astronomers define this distance as one astronomical unit AU , a measure that serves as a handy cosmic yardstick. Earth rotates on its axis every This axis of rotation is tilted Whichever hemisphere is tilted closer to the sun experiences summer, while the hemisphere tilted away gets winter. In the spring and fall, each hemisphere receives similar amounts of light.

On two specific dates each year—called the equinoxes—both hemispheres get illuminated equally. About 4. Over time, Earth's interior—which is made mostly of silicate rocks and metals—differentiated into four layers. At the planet's heart lies the inner core, a solid sphere of iron and nickel that's miles wide and as hot as 9, degrees Fahrenheit.

The inner core is surrounded by the outer core, a 1,mile-thick band of iron and nickel fluids.

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