Water

What percentage of our body weight is water?

What is the largest ocean on Earth?

How is sewage cleaned before being returned to a river or pumped into the sea?

What is the average amount of water used by a person living in a town or city in one year?

What is the process of making water safe to drink?

What is the definition of a desert based on the average rainfall?

What are the two types of camels?

• Dromedary Camel

• Bactrian Camel

Why are tropical rainforests important?

How do nomadic Bedouins protect themselves from the heat, cold, and wind-blown sand?

What is the percentage of the world's land area that consists of tropical rainforests?