What do plants need to grow?

What gas do we breathe in to stay alive?

What do bees make?

What is the main source of energy for Earth?

Why do we see lightning before we hear thunder?

What is the boiling point of water at sea level?

What is the function of red blood cells in the body?

Which of the following causes metal to rust?

What part of an egg becomes a baby chick?

Why does ice float on water?