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External and Internal Energy

By: Meredith S, Jake S, David B, Ethan F, and Paige B.

Meredith Sheatzley

on 7 December 2012

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Transcript of External and Internal Energy

Internal and External Energy! Internal Energy External Energy Internal Energy Sources External Energy Sources Internal energy comes from decay radioactive energy and from gravitational energy released when the earths formed.
The earth uses these energy's to renew the surface of the earth and drive the movement in the plates on the Lithosphere. Energy that comes from the sun:
Solar energy/radiation

Earth has two principal sources of energy: internal (coming from itself) and external (from the sun). Internal energy comes from radioactive decay and gravitational attractions which keeps Earth's interior warm and in turn, keeps Earth's surface warm.This drives plate movements for the tectonic plates.
Radioactive decay - When atoms lose energy and release it as waves (radiation) of heat from the center towards the outside of Earth.
Gravity - When attraction between matter produces heat from pressure External energy comes from solar radiation.
Solar radiation warms the Earth's atmosphere and surface.
This generate winds and ocean currents which affect the climate system. Gravity: Force that pulls all objects toward earth's center/core, produced through earth's system.

Gravity can be considered an energy. For example just thinking of releasing an object, a ball and letting it fall to the ground. Energy of motion (kinetic energy) is produced, as the ball accelerates downward.
If we think of the sun as a huge sphere of gases, each atom in the gas feels a net attraction to the center of the sphere. So all the atoms have a tendency to "fall" in toward the center. Sun radiation
It's very hot about (6000 degrees celcius) Most of the radiation is emmited through short wavelengths.
The sun radiates in all directions which means that only a fraction of the energy is intercepted by the earth. Radioactive Decay Involves transformation of one element to another. The nuclei are unstable and will eventually decay by emmiting a particle, transforming the nucleus into another nucleus or into lower energy state.
Think of popping popcorn. When the kernels are poured into the popcorn popper, there is no way to know which will pop first, and once the kernal pops, it will never be a kernal again because its changed forever.
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