You answered it yourself??
Burning is a chemical process that involves a substance being broken down and changed into different substances so It is.
For the other question you can determine it by it’s reaction to the heat.
Answer:
Algunos de los ideales que guiaron la lucha de Nelson Madela fueron equidad y justicia, servicio, dignidad y no racialismo.
Explanation:
Knots usually take 1 minute or so to do. If you keep on tying the knots and get used to the pattern, you will get faster and faster and eventually will be able to do it in 4 seconds. It is kind of like picking strawberries. If you keep on picking strawberries and timing yourself, you will get faster like when you typed the knot