By the unequal heating of earths surface
Heat increases. Smoke is hot, and as long as you have a cooler air Gulf to the burning substances, then the smoke will rise.<span>
Happy studying ^-^</span>
The answer is 4. Hope this helps
Henry Faulds and Galton are cousins which both helped each other like Faulds wrote a book about fingerprints which helped Galton out a lot.
Faulds was also the Father of Fingerprinting.
hope i helped ~Zuzu :)
