The chemical bonds in CH4 are all single bonds. C only can bond 4 times because it needs 8 electrons in it's outer shell and only has four right now. The bonds represented are all single bonds because there are two electrons present on each side of the carbon. Two electrons, in this case, equals one bond.
The metric system is used all around the world because it goes off a ten number base and is easy to calculate.
qualitative data is in words
quantitative data is in numbers
I'm pretty sure the correct answer is fusion. I'm not 100% sure but I hope this helps.
Convection between the metal and wood increases the most ion of the wood molecules