Structure of the Earth

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Life on Mars and Life on Earth

Life on Earth
-Right spot, suitable for life
-Size of earth has allowed the internal heat from leaking too rapidly -Plate tectonic activity and bulkinism helps maintain and recycle carbon dioxide which helps prevent the earth from freezing -The magnetic field from the inner core maintains heat at a certain level protecting earth -Within the atmosphere, there exists hydrogen, water, methane and ammonia -These gases are subject to lightening and therefore form an electrical discharge -These interactions of gases, electrical discharge and organic compounds help create amino acids

Life on Mars
-Does not have a global magnetic field to shield it from solar flares and cosmic rays -There is evidence of past water channels, dry lakes and minerals -At present, bacteria is within rocks and soil

-Present and future searches, focuses on the extinction of life

The Celestial Objects

1.Comet
-Larger in size, containing mostly of gas and water with little rock material -Orbits space, quite visible
-Famous one; Hailey’s Comet
2.Meteor
-Leftovers of comets/asteroids due to collisions
-Contain gas, water, and rock material
-Smaller than comets, size varies, visible
3.Asteroids
-Known as planetoids/smaller planets
-Sizes vary from big to small
-Made of metallic iron and nickel
-On the surface of asteroid – regrowth; fragmented rock debris -Breccia; surface of asteroid composed of broken rock fragments cemented together 4.Bamnger Crater
-Caused by asteroid
-50 000 years ago, formed by iron meteor
-30-50m in diameter and 1200m in diameter, 200m deep

Impacted Diameter
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