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life is a good thing.
The sun
there are many reasons for heat in earths crust. like the friction between rock masses during movements of earths crust. there may also be heat left over from the original heat of earths interior. but the main reason for heat in earths crust is radioactive elements. they give off energy that can be absorbed as heat. some radioactive elements include uranium, thorium, and a form of potassium.
heat
Earths heat
The disadvantages of heat are that if there is no solar energy, then there is no heat.
we used the earths heat for gloderal wornng
life is a good thing.
The earths core.
Sun
The sun
How do changes in heat energy affect the density of earths mantle material
there are many reasons for heat in earths crust. like the friction between rock masses during movements of earths crust. there may also be heat left over from the original heat of earths interior. but the main reason for heat in earths crust is radioactive elements. they give off energy that can be absorbed as heat. some radioactive elements include uranium, thorium, and a form of potassium.
heat
Geothermal energy.
The Sun.
Earths heat