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__PLANET EARTH__

By: Courtney Burcham, Alyssa Patterson, and Laurana Lehman


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 * Everyone has lived on Earth. Since you live on Earth, why do you need to learn about Earth? Well, you know that Earth supports life and it has water and air. You know that people and other living things need Earth in order to live. That is all things** **ON** **Earth. Do you know the things that happen outside Earth? How about how far it is away from the sun?** **Did you know that we sent a dog into** **space?** **If you read on, you will learn more about Earth and learn things that you never knew before!**



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Here is some basic information about the planet Earth. You might know some of these fact but it is surprising how many other people don't. As you already know, this planet is name Earth. We have only one moon and its name is Luna. Luna lies about 384,400 kilometers away. It has mountains, valleys, old volcano sites, and many other craters. Our atmosphere is known as the Troposphere. It is the first layer above the surface and contains half of the Earth's atmosphere. From the Sun. it is the third planet from the Sun. The distance from the Sun is 150 million kilometers (93 million miles). The revolution period is 365.26 earth days. The rotation period is 23 hours, 50 minutes, and 4.1 second for one rotation. **



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 Some of you might think that the Earth is a boring subject, but there are lots of amazing things to learn about. Have you ever thought about how fast the earth is spinning or how fast we orbit the Sun. Well, we go about 18.5 miles per second in our orbit around the Sun. We also go about 150 miles per second when we are rotating around the middle of the Milky Way. That is pretty fast, isn’t it? On different planets. you weigh different weights, because of gravity. On Earth, if you weigh 110 pounds, you will weigh 18.3 pounds on the moon; or if you weigh 170 pounds, you will weigh 28.2 pounds. Same with your birthday, if you are born on December 5 or August 16 than you next birthday will be the same day again, the next year. On a Science Project, have you ever had to make a model solar system to scale? Well, imagine that your Sun is 615 millimeters, than your earth would have to be about 5.6 millimeters. Do you know that because of the moon, the earth’s orbit is slowing 2 millimeters every one hundred years? Nine hundred billion years ago, there were 418 days in a year and each were eighteen hours long. Earth is the densest planet and the only planet that has water in the form of a liquid, gas, and a solid. We are also the only planet to support life. Did you know that scientists use the earth to study other planets? How do they do that you ask? They use Earth to compare the other planets to each other. The Earth only has one observing satellite on orbit, but we have many communicating satellites.

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 * Every has sent out many satellite. A satellite, called JDL(Acrimsat), was launched 10 years ago. It continues to improve climate change predictions. There has been no new informations yet. Another satellite, called the Sputnik, was launched on 10-4-1957. It is suppose to be easily visible from the ground. Sputnik 2 was launched 11-3-1957.** **It carried a dog named Laika into space!** **It has development of space technology. A satellite, Kepler, mission was to discover Earth-like planets around Sun-like stars. The results was 100,00 solar-type stars for 46 years.**

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On Earth, everyone has their own beliefs on how Earth came to be, but one thing is certain. That the planet Earth was not discovered by man, it is just there in existence. Do you know where the word Earth comes from? It comes from the Middle English word, erthe, which means ground. Did you also know that the Romans thought the Goddess Telus, which means fertile soil, was the goddess of the earth? The Greeks called her Gaea. They thought she was the mother of the mountains, valleys, and other land features and that she was the wife of Uranus. The Egyptians called her Geb, who was a bearded old man with a goose head. Every civilization had a different name for the earth. Every planet has a symbol that stand for its name; earth’s symbol is a circle with a (t) through it. http://www.starcraftsob.com/craft/ostaralore.shtml The mass of Earth is 5.97e+24. Earth's diameter is 12756.3 kilometers. The density of Earth is 5.513g/cm3. Earth's average temperature is  7.2 degrees celsius. Our planets escape velocity is 11.182 km/s. ** **Earth has many features that make it unique. Water exists on Earth as a solid, gas, and liquid. Life is supported here on Earth by our thick atmosphere. Earth is the only planet where life can be found, so far.
 * Earth's atmosphere is amazing. It is the only atmosphere that allows life to thrive. Our atmosphere is mostly composed of nitrogen and oxygen. There are also traces of argon, carbon dioxide, and water. Nitrogen makes up 77% of the atmosphere, where as oxygen only makes up 21%. The other 1% is water, carbon dioxide, argon, and others that are in insignificant amounts.

There are seven main layers of Earth. These layers are-** **Crust : 0-40 km ** **Upper Mantle : 40-400 km ** **Transition Region : 400-650 km ** **Lower Mantle : 650-2700 km ** **D" Layer : 2700-2890 ** **Outer Core : 2890-5150 km ** **Inner Core : 5150-6378 km **  __

Work Cited__: [] [] [] [] [] [] Astronomy For Kids. 18 December 2009. Field Guide to the Universe. 18 December 2009. The Nine Planets. 19 December 2009.