1) What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of...

Question

2) Why do we dream?
3) What kind of waves are present during an earthquake? ...

Answer 1

Answering these three questions would require hours and hours of reading and more hours and hours of summarizing the information to write it for you. I'm not inclined to do that when you can do it yourself. I suggest you Google those three questions, separately of course, and read, read, read. Good luck!