Paragraph on water cycle for class 7th
Answers
Explanation:
The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water and atmospheric water is variable depending on a wide range of climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor.
The water cycle involves the exchange of energy, which leads to temperature changes. When water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment. These heat exchanges influence climate.
The evaporative phase of the cycle purifies water which then replenishes the land with freshwater. The flow of liquid water and ice transports minerals across the globe. It is also involved in reshaping the geological features of the Earth, through processes including erosion and sedimentation. The water cycle is also essential for the maintenance of most life and ecosystems on the planet.
Answer:
Around 70% of the Earth is wrapped in water in the form of ice, seas, oceans, rivers, lakes, ground water and moisture in the surrounding. But large amounts of water is not suitable for man consumption. Only fresh water is fit for human consumption. Means 0.006% of the water is only available for use.
As a solid form, it resides as glaciers, snow mountains and ice caps at the poles.
As a Liquid form, it exists in oceans, seas, rivers, lakes and ground water.
As a gaseous form, water vapors in the air.
Water Cycle
The continuous process of evaporation, condensation, precipitation, infiltration of water in nature keeps the level of water on the earth constant is called the water cycle. Now understand
Evaporation
Evaporation is the process of conversion of water molecules into vapor.Water vapor accumulates in the sky in the form of clouds.
Condensation
Condensation is the process of conversion of water vapor into water by cooling.
Precipitation
Precipitation occurs when water falls from the sky in the form of rain, snow, hail, or sleet.
Infiltration
Infiltration is the process of seeping of water into the ground.