Chloe+D

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** Facts! ** Earth is made up of the following; Oxygen = 46.6% Aluminum = 8.1% Iron = 5% Sodium = 2.8% Magnesium = 2.1% Calcium = 3.6% Potassium = 2.6% Silicon = 27.7% Other = 1.5% Aluminum cans take 500 years. Organic materials take 6 months. Cotton, rags, and paper take 6 months. the oceans combined makes our planet look blue. Earth is about 3-5 billion years old. Earth is estimated to weigh 6,585,600,000,000,000,000,000 tons. The area of the earth is almost 200 million square miles. Earth travels through space at 66,700 miles per hour. Earth's oceans are about 2 miles deep. Earth's rotation on its axis makes a day at 24 hours. Earth's orbit around the sun makes a year at nearly 365 and 1/2 days Earth is tipped at 23 and 1/2 degrees in orbit. That axis is what causes our seasons. Antarctica is the coldest place on earth. The continent is almost entirely covered in ICE ! Only 11 percent of the earth's surface is used to grow food. Most of them are made out of gasses, and gas like substances called 'Plasma'. Every star starts out in a mass of clouds and gas called a 'nebula'. Gravity causes hydrgen gas in the nebula to spin. As the hydrogen gas spins, it becomes hotter. It starts to glow, which is the start of a new star, but Stars don't last forever. When the hydrogen in a star runs low, the star can no longer sustain nuclear fusion. It no longer has the energy to turn hydrogen into helium. That’s when a star’s fire begins to cool and the star begins to die. In the Milky Way, contains for than 100 billion stars. Did you know the sun is a star too? The sun, is the only star in our solar system, and the star, closest to earth.
 * Why does the earth spin? ** The earth spins on its axis bcause of conversation of angular momentum. The earth formed when gas left over from making the sun conoensed into the planets, as this gas cooled and condensed it started to spin faster. Now that it is spinning and not condesing anymore, it will keep spinning at a steady rate, unless something stops it. The speed is about 1,038 miles per hour!
 * Examples of how long it takes for garbage to break down; ** Plastics take 500 years.
 * OTHER INTERESTING FACTS; ** Earth is referred to as the blue planet, why? Because from space,
 * STARS! ** What are Stars made of?

THE MOON! ** The moon is another body in the solar system, it is covered with deep pockets called craters. One side of the moon is always facing earth. But, Earth turns on it's own orbit. When earth is facing the moon, and away from the sun we have night. The moon has no light of it’s own. It only reflects the light from the sun.

As of July 2009, 6.8 billion people were living on Earth! The number increases about //212,035// thousand, everyday!
 * Did you know? **

** RESOURCE 1. ** [|All about planets.] **RESOURCE 2. [|All about stars.]

MINOR PROJECT; - Make a glossary. ** Airglow, - The natural glow of the night sky. Apogee, - The point in an objects orbit, when it is furthest from the Earth. Aerolite, - A meteorite that is stoney. Asteroid, - A rock, or Minor Planet orbiting the Sun. Axis, - An imaginary straight line, that the planets rotate on. Barycentre, - The center of gravity of the Earth, and moon. Blackhole, - A big black hole in the sky, so strong that not even light can escape it. Comet, - A small, frozen mass of dust, & gas revolving around the sun. Earthshine, - A faint glow, caused by light reflecting off the Earth. Eclipse, - When an object in the sky, is blocked by another object in the sky. Equinox, - Twice a year, when the day and night are the same amount of time all around the world. Galaxy. - A group of stars, gas and dust held together by gravity. Gibbous, - When the Moon is more than half full, but less than completely full. Milky Way, - Our Galaxy. Orbit, - The path one object takes around another. Photosphere, - The bright surface of the Sun. Planet, - An object moving around a star. Shooting Star, - A light in the atmosphere caused by a meteor falling towards the Earth. Troposphere, - The lowest part of the Earths atmosphere. Zenith, - The point directly above your head, in th night sky.

**RECOURSE 1.** [|Space words, and meanings.]