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EARTH
Earth is our home planet, and it is the third (3rd) planet from the Sun. Earth's average distance from the sun is about 93 million miles or 149 million kilometers. Earth is located at the goldilocks zone or habitable zone from our Sun.

How does Earth support life?
Our Earth supports life because of this factors:


 * Distance of the Earth from the Sun.
 * Importance of light on the Earth.
 * Importance of Earth's Atmosphere.
 * Importance of Ozone Layer.
 * Favourable Climatic Condition.
 * Water.
 * Force of attraction And because of these factors life has been going on since 3.7 billion years ago.

How do we have day and nights?
At all times, half of the Earth is lighted by the sun while the other half of Earth is engulfed in darkness. As the planet spins, most places on Earth cycle through day and night once every 24 hours. The North Pole and South Pole have continuous daylight or darkness depending on the time of year.

How does Earth have seasons?
Our planet Earth has seasons, because of our planet's axis. Earth rotates on its tilted axis which is about 23.5 degrees. Since our planet is rotating at a tilting point, the Sun's rays hit the planet at different angles thus having seasons depending on the time of the year. From June to August, the sun's rays hit the Northern Hemisphere more directly than the Southern Hemisphere. The result is warm (summer) weather in the Northern Hemisphere and cold (winter) weather in the Southern Hemisphere. From December to February, the sun's rays hit the Northern Hemisphere less directly than the Southern Hemisphere. The result is cold (winter) weather in the Northern Hemisphere and warm (summer) weather in the Southern Hemisphere. From September to November, the sun shines equally on both hemispheres. The result is fall in the Northern Hemisphere and spring in the Southern Hemisphere. The sun also shines equally on both hemispheres from March to May. The result is spring in the Northern Hemisphere and fall in the Southern Hemisphere. ( source - https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-earth-58.html )

What does Earth look like in space?
Earth from space looks like a giant blue marble, with white swirls and areas of brown, yellow, green and white. The blue is water, which covers about 71 percent of Earth's surface. The white swirls are clouds. The areas of brown, yellow and green are land. And the areas of white are ice and snow. (source - https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-earth-58.html)

What Are Earth's Different Parts?

Earth consists of land, air, water and life. The land contains mountains, valleys and flat areas. The air is made up of different gases, mainly nitrogen and oxygen. The water includes oceans, lakes, rivers, streams, rain, snow and ice. Life consists of people, animals and plants. There are millions of species, or kinds of life, on Earth. Their sizes range from very tiny to very large.

Below Earth's surface are layers of rock and metal. Temperatures increase with depth, all the way to about 12,000 degrees Fahrenheit at Earth's inner core.

Earth's parts once were seen as largely separate from each other. But now they are viewed together as the "Earth system." Each part connects to and affects each of the other parts. For example:


 * Clouds in the air drop rain and snow on land.
 * Water gives life to plants and animals.
 * Volcanoes on land send gas and dust into the air.
 * People breathe air and drink water.

Earth system science is the study of interactions between and among Earth's different parts.

( source - https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-earth-58.html )

What is a planet?
This seemingly simple question doesn't have a simple answer. Everyone knows that Earth, Mars and Jupiter are planets. But both Pluto and Ceres were once considered planets until new discoveries triggered scientific debate about how to best describe them, a vigorous debate that continues to this day. The most recent definition of a planet was adopted by the International Astronomical Union in 2006. It says a planet must do three things:


 * 1) It must orbit a star (in our cosmic neighborhood, the Sun).
 * 2) It must be big enough to have enough gravity to force it into a spherical shape.
 * 3) It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun. source - https://solarsystem.nasa.gov/planets/in-depth/

What is Goldilocks zone?
The 'Goldilocks Zone,' or habitable zone, is the range of distance with the right temperatures for water to remain liquid and thus supporting life. (source - https://exoplanets.nasa.gov/resources/323/goldilocks-zone/)