The Earth contains three distinct layers. The core is the central part. It is constructed of molten nickel and iron; their movement produces Earth's magnetic field. The following layer is the mantle. It contains hot rock, solid. The crust upon which we live and walk is the upper most layer, consisting of clay, soil and fine rock.
The atmosphere provides five layers. The layer nearest to the surface is referred to as the Troposphere. It is approximately 3.2 km (two miles) thick and can include low lying clouds. The next layer is the stratosphere. The stratosphere is approximately 21 km (13 miles) thick and includes the high cirrus and cirrostratus clouds. The greatest altitude commercial planes fly at this level. The level over the stratosphere is the Mesosphere. Above the Mesosphere is actually the Thermosphere. Mixed, the Mesosphere and the Thermosphere generate the Ionosphere, that is 435 km (270 miles) thick. The final layer of our atmosphere is the Exosphere, which extends into space.
Characteristics of Earth: The Earth is the sole planet, that people currently know of, capable of keeping life. A number of factors resulted in the development of life: Very first, Earth needed to be at a temperate distance through its host star.
This implies that the planet has to be at a distance through the star to permit liquid water to exist and for that temperature range to be not too extreme. Next, Earth posseses an atmosphere and that atmosphere has (and had) a chemical makeup that enables the development of existence. 3rd, Earth has water. Biologists think that this is one of the most essential constituent for life to exist.
Our planet Earth is actually a rotating sphere which orbits the Sun. The Planet's axis of rotation is at a continuing tilt with regards to its orbit close to the Sun, leading to the change of seasons. The physical characteristics of the Earth contain its composition and size. The Earth also has magnetic force fields and gravity.
The Earth is the 3rd planet through the Sun, with Venus and Mercury being closer. Its special position provides the Earth a temperate climate, permitting the chemical reactions required to maintain life. But over the years, the climate has diverse enough to melt the ice caps close to the South and North poles or to cause glaciers to go south in an Ice Age.
Just like the Moon and Sun seem as spheres, also is the Earth spherical in shape. To those on Earth, the planet seems to be generally flat (not counting for valleys and hills), however in reality the surface of the Earth features a slight curve. This can be noticed when looking on the ocean or a large lake and viewing a ship come up along the horizon.
The terran system is actually a small planet which could only be explained as the most wonderful sight in the whole solar system. Sparkling before us is actually a bright blue gem of dazzling complexity. Delicate white clouds dance above its surface of brilliant blues, browns and greens. This is the Earth. It is the 3rd planet from the Sun and it is our residence. Only slightly bigger than Venus, Earth is the biggest of the four terrestrial or rocky internal planets in the Solar System. It is also the densest of the 4.
You can find two extremely important factors which distinguish this planet from others in the Solar System. First, it is the sole planet known to include liquid water on its surface. It is the availability of this water which gives rise to Earth's 2nd unique feature. It is the only recognized planet to support life.
The top of Earth is literally coated with water. Almost 3/4 of the earth's surface is fluid water. Water is also present in abundance as water vapor in the atmosphere and as ice in the planet's poles. Most of this water had been thought to have been deposited by vast amounts of years of volcanic activity. Several scientists think that water may also have been brought to Planet by early comets. It is this water, mixed with Earth's ideal distance from the Sun, which has given rise to the Solar System's only known life forms.