Problem: Write a question you would see in a school textbook.

Answer: Which property of Earth's interior keeps the innermost part in a solid state?

Problem: Write a question you would see in a school textbook.

Answer: Ninety-nine percent of the mass of an atom is located in

Problem: Write a question you would see in a school textbook.

Answer:
When water vapor rises and cools, the liquid water in the air comes together forming