ENERGY IN EARTH PROCESSES

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ENERGY IN EARTH PROCESSES

• TOPIC 5

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ENERGY IN EARTH PROCESSES

• ENERGY the ability to do work

• basic property of the universe
• e.g. mass, time or distance

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ENERGY IN EARTH PROCESSES

• Earth has 2 heat engines
• External ? SUN

• Internal ? Heat from the interior of Earth

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EARTHS ENERGY SUPPLY

• MAIN Source of Energy

• Produces energy by
• nuclear fusion
• Radiates ELECTROMAGNETIC ENERGY
• mostly UV Visible Light

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EARTHS ENERGY SUPPLY

• Earths INTERIOR Energy
• Heat leftover from the formation of the Earth
• Heat generated by gravity pulling matter towards
  the center of the Earth
• Most heat comes from Nuclear Decay (Nuclear
  Fission)

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EARTHS ENERGY SUPPLY

• Nuclear Decay (Nuclear Fission)
• a large unstable nucleus splits, forming
  smaller nuclei subatomic particles, and
  releasing energy.

?ENERGY
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ELECTROMAGNETIC ENERGY

• ENERGY RADIATED BY ANY OBJECT WITH A
  TEMPERATURE ABOVE ABSOLUTE ZERO.
• aka E-M energy

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ABSOLUTE ZERO

• CONDITION IN WHICH MATTER DOES NOT HAVE ANY
  ENERGY!

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ELECTROMAGNETIC SPECTRUM
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ELECTROMAGNETIC SPECTRUM
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ELECTROMAGNETIC SPECTRUM
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Parts of a WAVE
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Parts of a WAVE
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How does E-M energy interact with matter?

• Transmitted energy is not affected as it passes
  through matter
• Refracted energy changes direction as it passes
  through matter

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How does E-M energy interact with matter?

• Reflected energy changes direction by bouncing
  off matter
• Absorbed energy retained by matter

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How does E-M energy interact with matter?

• Surface Characteristics determine type of
  interaction between E-M energy matter
• Color
• Light ? Reflects
• Dark ? Absorbs
• Texture
• Smooth ? Reflects
• Rough ? Absorbs