What is supposed to be the cause of global warming ?
Increasing amount of carbon dioxide is the cause of global warming.
Why is a match stick rubbed against a rough surface to light it ?
Goldsmiths blow the outermost zone of a flame with a metallic blow pipe for melting gold and silver. Why do they use the outermost zone of the flame ?
What are combustible and non-combustible substances ? Explain with examples.
Why does paper burn with a yellow flame ?
