Hydrologic cycle: 

What is hydrologic cycle?

The movement of water in biosphere, atmosphere, and lithosphere in a cycle is known as the hydrologic cycle.

Explanation:

The water in and on our earth is not just in liquid form. It changes forms and turn into liquid, solid and even gas at times. This changing of water in different states in different spheres is called hydrological cycle. 

Importance of the hydrologic cycle:
The hydrological cycle is very important it is the means through which we get fresh water on earth. This process also helps to maintain the temperature on the earth. The most important feature of the hydrological cycle is that it circles the water through the three living spheres of biosphere, atmosphere, and lithosphere. There are various procedures that take place in the hydrological cycle. These processes include evaporation, condensation, precipitation, runoff, infiltration, transpiration and many other to ensure the water availability. Let's look at these processes individually.

⦁ Evaporation: This is the process of  the hydrological cycle that turns the water into vapors and gaseous states. the energy to carry out comes from sun. The water in open places like lakes, streams, and oceans evaporates with the solar energy, turn into vapor and become disperse in the atmosphere. This process is usually considered as the first step of hydrologic cycle.

⦁ Condensation: The second step of condensation is very important in moving the hydrological cycle to next phase. In condensation the water that evaporated in the first step and is in the form of vapour condenses to little water droplets that become suspended in the air and form clouds. Clouds may look like cotton but they are formed of many trillion tons of water. The clouds hold the water against the force of gravity. The energy source for this step is also the solar energy. 

⦁ Precipitation: This is the next step of the hydrological cycle.if you think precipitation is rain , you may be wrong. Precipitation is any form of water that falls on the ground. the rain, snow, mist, fog, sleet, hail or any form that you can think of is precipitation. in this step the water that evaporated from the earth into atmosphere, comes back but now it can be termed as fresh water.

⦁ Lithosphere runoff: This is the process by which water again adds into oceans or other water bodies. The rain, or snow that has precipitated now runoff on the ground and become a part of the water already present on the ground. Some water directly precipItates on the water bodies.

⦁ Infiltration: Some of the 3% freshwater that we have on the earth, some is imprisoned in the ground as groundwater. This water becomes the part of ground when some water from rains or precipitatIon methods flows into lithospheric crust instead of oceanic crust. It gives moisture to our soil.

⦁ Transpiration: Transpiration is the water that directly evaporates from the plants' surface. This process is called transpiration because the water become a part of the atmosphere through the leaf of plants.

 Now, we have seen how water moves in the atmosphere, lithosphere and biosphere by a complete cycle that's why it is called the hydrological cycle. 

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