What is the largest source of freshwater on Earth?

What is the process by which water changes from liquid to vapour?

Which form of water is found high in the atmosphere as clouds?

What percentage of Earth’s water is freshwater?

The movement of water between sea, land and air is called the:

Which of the following is NOT a source of freshwater?

Which gas is dissolved in water and is essential for aquatic animals?

What is rainwater harvesting mainly used for?

Which of the following is an example of water pollution?

Which of these is the main cause of ocean tides?