Energy in Earth Processes - Mr. Stephens Earth Science€¦ · Energy in Earth Processes . What is...
Transcript of Energy in Earth Processes - Mr. Stephens Earth Science€¦ · Energy in Earth Processes . What is...
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Energy in Earth Processes
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What is Energy?
Energy: The ability to do work
Everything that is done in the universe – involves the use or transfer of energy.
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Types of Energy
EXAMPLES
AT THE TOP OF A SKI SLOPE
WATER BEHIND A DAM
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Types of Energy
EXAMPLES
SKIING DOWNHILL
THROWING A BOWLING BALL
WATER FLOWING IN A RIVER
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Conduction
Transfer of energy due to collision of molecules. *Mostly in Solids*
Handle on metal frying pan gets hot.
Convection
Transfer of energy caused by differences in density. *In Liquids and Gasses*
Warm, less dense = Rises
Cool, more dense = Sinks
Radiation
Transfer of energy by electromagnetic waves. *In solids, liquids, gasses and empty space*
-Light energy from the sun. - Microwave
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http://www.teachersdomain.org/resources/lsps07/sci/phys/energy/heattransfer/assets/lsps07_int_heattransfer/lsps07_int_heattransfer_swf.html
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Conduction
Convection
What type of Energy Transfer is going on???
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Electromagnetic Energy:
- Energy that is radiated in the form of a transverse wave.
-This is how we get energy from the sun.
- Difference between forms of electromagnetic energy is due to size of wavelength.
- Shorter wavelength= more powerful
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• http://www.teachersdomain.org/asset/ess05_int_irgallery/
• And video
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Range of radiation identified by wavelength.
14
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When ELECTROMAGNETIC ENERGY (RADIATION) REACHES EARTH it is …
Reflected – bounced back at the same angle they arrived
Scattered – reflected in various directions
Refracted – bent
Transmitted – pass through the material
Absorbed (taken in as heat energy)
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Surface Properties and Absorption/Reflection
On a hot summer day, what color clothes do you wear?
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dark & rough
light colored & smooth
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Absorb Radiation from the sun.
Reflect Radiation from the sun.
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Absorb Radiation from the sun.
Reflect Radiation from the sun.
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What is a better absorber of radiation???
-Land is a better absorber and radiator of radiation from the sun.
- Most of the time land is darker and rougher then water.
Ex: Dark forest canopy, blacktop.
** A good absorber of energy is also a good Radiator of energy. (Dark and Rough)
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The resistance of a material to heating up or cooling off.
Water has a high specific heat. It heats up ____________ and cools off _____________. SLOWLY SLOWLY
1
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Heating of Water
Label the following terms in their correct places: condensation, vaporization, solidification, melting.
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Heat Energy and Changes of State
1) Melting
The changing of a solid to a liquid
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Reference Table page 1
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ICE
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Heat Energy and Changes of State
2) Solidification: (Freezing)
The changing of a liquid to a solid.
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Reference Table page 1
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FOG, STEAM
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Heat Energy and Changes of State
3) Evaporation, or Vaporization:
The changing of a liquid to a gas, or water vapor.
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Reference Table page 1
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Heat Energy and Changes of State
4) Condensation:
The changing of a gas, or vapor to a liquid.
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Reference Table page 1
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Heat Energy and Changes of State
Sublimation:
- The changing of a gas directly to a solid, or from a solid directly to a gas.
- Without going through a liquid state
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Properties of Water ESRT pg 1
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Changes in state of water.
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Transfer of Energy
Dynamic Equilibrium: At dynamic equilibrium a region loses and gains equal amounts of energy.
Example : Temp. remains constant
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RADIATION BALANCE
DYNAMIC EQUILIBRIUM
INPUT = OUTPUT
Is global warming changing the balance???????
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