The number 2 indicates that there are two atoms of hydrogen in a molecule of water. There is also one atom of oxygen but the number one is omitted from a chemical formula.…
What are water resources?
Water resources are sources of water that are useful or potentially useful to humans. Activities that humans may use water for include agricultural, industrial, household, recreational, and environmental activities. Virtually all of these uses require fresh water. However, 97.5% of …