Well, honey, the 13-letter word you're looking for is "geothermalism." It's like the Earth's way of saying, "Hey, let me warm things up for you." So next time you're feeling cozy by a volcano, just remember it's all thanks to good ol' geothermalism.
The heat intensified as we got closer to the power source
heat is a mesurment of an object or weather or experiment
The 6letter word woth the second letter 'E' and the units for it is newtons is weight.
There is no double letter word with the letter x
Perhaps you are thinking of the word scientific.
THE SUN!!
tangerine
Ore
The data source is located in Excel. The main letter is in Word and the addresses for each custom letter come from Excel.
Warmth
Bacon
Therm
Heat
fever
A river source is also called a "rise"
Source.
Source