Water Cycle

The water cycle, also known as the hydrologic cycle, is the continuous process by which water moves from the Earth’s surface to the atmosphere and back again. It is an essential process that helps to sustain life on Earth.


The water cycle begins with evaporation, which is the process by which water changes from a liquid to a gas. This occurs when the sun heats up bodies of water, such as lakes, rivers, and oceans, causing water molecules to break apart and rise into the air as water vapor.


As water vapor rises into the atmosphere, it cools and condenses into tiny droplets of liquid water, forming clouds. This process is called condensation.


When the water droplets in the clouds become too heavy, they fall back to the Earth’s surface in the form of precipitation, such as rain, snow, sleet, or hail. This is the primary way that water returns to the Earth’s surface.


Once precipitation reaches the Earth’s surface, it can take several different paths. Some of the water may be absorbed into the ground, a process called infiltration. The water may also flow over the surface of the ground as runoff, eventually making its way into streams, rivers, and oceans.


Plants and trees also play an important role in the water cycle through a process called transpiration. This is when water evaporates from the leaves and stems of plants and enters the atmosphere as water vapor.


The fifth stage of the water cycle is runoff. This is when precipitation flows over the surface of the Earth, often collecting in rivers, lakes, and oceans. Runoff can cause erosion and carry pollutants into bodies of water.


Some of the water that is absorbed into the ground during infiltration becomes groundwater. This is water that is stored in underground aquifers and can be accessed through wells and other sources.

Water Cycle and Climate Change:

The water cycle is influenced by climate change, which is causing changes in precipitation patterns, melting glaciers, and rising sea levels. These changes can have significant impacts on ecosystems, agriculture, and human populations. The water cycle is a continuous process that helps to sustain life on Earth by ensuring the availability of water. Through the processes of evaporation, condensation, precipitation, infiltration, transpiration, and groundwater, water moves between the Earth’s surface and the atmosphere. It is a dynamic and complex system that is influenced by many factors, including climate change.

Oxygen Cycle

Nitrogen Cycle