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Structure of the Earth

Topics: Planet, Solar System, Oxygen, Jupiter, Earth, Mars / Pages: 2 (255 words) / Published: Feb 25th, 2013
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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