It is a form of energy that enables us to see the things around us.

These are objects that produce visible light. They give off light of their own.

It is the production of light by an organism as a result of the chemical reaction within the organism's body.

Which is NOT true about light?

Which of these is not a source of natural light?

Why are we able to see the moon?

Why do people use heat at home?

It is the main source of light and heat on Earth.

The universe is made up of tiny particles known as _________________.

An increase in the motion of these particles creates a form of energy called ___________.