What is the chemical formula for table salt?

What is the name for the phenomenon where a wave bends as it passes from one medium to another at an angle?

Which layer of the Earth's atmosphere is characterized by the presence of the ionosphere and where auroras occur?

Which space telescope has provided stunning images and valuable data about the universe since its launch in 1990?

What is the term for the process by which rocks are broken down into smaller particles through the action of wind, water, or ice?

What is the chemical symbol for silver nitrate?

What is the process by which a star, much larger than our Sun, ends its life in a massive explosion?

Which layer of the Earth's atmosphere contains the ozone layer and where most weather phenomena occur?

In the periodic table, which period do the alkaline earth metals belong to?

In the water cycle, what is the term for the process by which water vapor is released from the surface of leaves into the atmosphere?