The Industrial Revolution created a mass rural-urban migration
I am guessing but im not sure i think the answer is humidity
They are electromagnetic waves because mechanical waves have to be physically created by something, while electromagnetic waves are just emitted without any effort or force.
Answer:
Get off your lazy butt and ask your teacher or family or even friends to help you.
Explanation: your probably a little fat kid LOL
TheRubyDragon825 is GAY NO LIE