Earth By Omar Roman

Basic Facts Third planet from the Sun Diameter: 12,753 km (7,926 miles) Rotation Period with respect to Sun (Length of Day): 24 hrs Mass: 5.98x10^24 kilograms (6.5e21 tons) Rotation Period with respect to stars (Sidereal Day): 23 hrs 56 min Revolution Period about the Sun (Length of a Year): 365 days 5 hrs Minimum Distance from Sun: 146 million km (91 million miles) Tilt of Axis: 23o 27" Maximum Distance from Sun: 152 million km (94.5 million miles) Temperature: -89o C to 57.7o C (-128o F to 136o F) Average Surface Temperature (K): 287K Satellites: 1 (the Moon)

Earth’s History Earth is 4.54 billion years old The Earth has experienced 5 mass extinctions throughout its lifetime

Earth Compared to the Sun Earth is very small compared to the Sun 1,300,000 Earths can fit inside of the Sun The Earth’s core is hotter than the surface of the Sun Surface of the Sun=5,778 K Earth’s Core=7,500 K

Earth Fun Facts Earth is the only planet with life that we know of so far. Earth’s name does not come from Greek/Roman mythology like the other planets We did not have maps of the entire planet until the 20th century It’s the densest major body in the solar system

Earth’s Layers 0- 40 km-Crust 40- 400 km-Upper mantle 400- 650 km-Transition region 650-2700 km-Lower mantle 2700-2890 km-D'' layer 2890-5150 km-Outer core 5150-6378 km-Inner core

Earth’s Atmosphere and Water Earth’s atmosphere contains 77% nitrogen and 21% oxygen with a mixture of argon, carbon dioxide and water 71% of the Earth is water 97.5% of all the water on Earth is saltwater 2.5% is freshwater Less than 1% (about 0.007%) of that 2.5% is accessible for human use

Problems Earth is Facing Population-More than 7,214,000,000 people inhabit the planet today and by 2050 it should reach about 9.5 billion people Climate Change- Our current activities have affected the climate so much that the damage is irreversible. Ozone Layer Depletion-In some areas 20% of the ozone layer has depleted since the mid-1980s Water 2.6 billion people lack adequate sanitation 1.1 billion people live without water

Bibliography http://coolcosmos.ipac.caltech.edu/ask/5-How-large-is-the-Sun-compared-to- Earth-?theme=cool_andromeda http://nineplanets.org/earth.html http://www.globalchange.umich.edu/globalchange2/current/lectures/freshwater_su pply/freshwater.html http://planetearthherald.com/top-10-environmental-issues/ http://static.guim.co.uk/sys- images/Guardian/About/General/2013/9/19/1379580203659/Hot-planet-Earth- 008.jpg (picture) http://thumbs.dreamstime.com/z/soccer-earth-26972030.jpg (picture) https://encrypted- tbn1.gstatic.com/images?q=tbn:ANd9GcRPSmgT1Ff4aEiThxUfwf2nUOhz5EkOgP9F ySLnVK9YV2Dp2B9x (Picture) http://i.imgur.com/DJS5WlF.gif (Picture)