The earth has not finished cooling down from when it was covered in lava.
Once it is done cooling, the earth will be like a giant and permanent ice age
radioactivity it says so
There are two types of mantles : the litosphere and the athenosphere.
the sun is our source of heat
Yes the sun is a source of heat.
Heat does, indeed, go from a warm source to a cold place. That is what heat always does.
it is rlow
The main source of energy and heat is the sun.
A heat wave is a source of thermal energy.
Yes, thorium is used in gas mantles; the intensity of the light is increased.
You need MTL2 mantles to fit this. I have this one in my yard. I have bought mantles on a couple of occasions from ebay. Just search for MTL2.
sun is the primary source of heat and light......
Stuff that is hot
It is a natural source of heat energy