Earth

Earth is the only place in the universe known to harbor life. It is a habitable planet, or in the "Goldilock's Zone" of space. Earth is 93 million miles away from the Sun, it is able support life.

A Year on Earth
How long is a year on Earth? Of course, 1 year on our calendar! This is the time it takes Earth to move across its oval orbit from the Sun. In January to March, it is winter in the Northern Hemisphere and summer in the Southern Hemisphere. From April to June, it is spring in the Northern Hemisphere and autumn in the Southern Hemisphere. From July to September, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere. For the most remaining part of the year (until December 21-22), it is autumn in the Northern Hemisphere and spring in the Southern Hemisphere. The coldest places on our Planet are the poles, which may have many hours of daytime or many hours of nighttime. The hotter places on our Planet are the equator, the Sun sets and rises nearly the same time all year round.

Atmosphere
The Earth has a deep sky, like all the planets, called an atmosphere. It is made of four layers: The troposphere is the lowest level, and it is where we currently live. The stratosphere is home to the Ozone Layer and weather balloons, and planes. The next layer is the mesosphere, where meteoroids burn up. And the thermosphere is 90 km above the Earth's surface, going up to space.

Oceans
70% of Earth's surface is covered by water. Most of the water appear in oceans. Lakes, rivers, creeks, dams, seas make up the surface. The deepest ocean part is 11 kilometers (6.8 miles) or 36,000 feet (11,000 metres) deep.

Land
The land only takes up 30% of the blue marble. Water is everywhere, some small lands in fact have water surrounding them entirely. These lands are called islands. Lands with many trees are called forests.

Mount Everest
Mount Everest is the highest mountain we know of, but if it were in the Challenger Deep, deepest ocean part, and you titled it upside down, and floated, it would not reach the floor bottom. It is only 29,000 feet high.