Understanding that hydrology is the study of water makes it easier to understand that there is a cycle for this. It is one that is quite fascinating but also one that the general population in Canada takes for granted. Understanding the hydrological cycle allows one to grasp the important concept of the Oak Ridges Moraine in Ontario, Canada.


This is where the hydrologic cycle begins. The air pulls water from the ocean surface. The air becomes moist from the water. The air then cools and has it is doing so the water vapour trapped in the air begins to condense. As a result clouds are formed. The evaporation is as a result of the sun heating up the surface molecules that have collected in the air.

Transportation Around the Globe

The moisture in the air circulates around the earth. Then it will return to the surface of the earth in the form of precipitation. When the water makes contact with the ground there are two things that can happen. What many don’t realize is that plants emit water as well from their leaves. Each plant that is healthy and growing can release anywhere between five to ten times the amount of water that it can hold at any one time.

  • Evaporation may occur and the water will re-enter the air.
  • The water can seep into the ground and then becomes groundwater.

The cycle is continuously revolving meaning that which becomes groundwater eventually finds its way back into the atmosphere from its surface. This process is called percolation. Most often a portion of the precipitation back to the bodies of water like the oceans, seas and rivers, where water was drawn up into the that hits the ground will end up as groundwater. It is like the evolution of water.

This cycle is critical to survival and the health and well being of the earth all that live on it.