Question

paragraph writing of water cycle

Answer 1

The water cycle, also known as the hydrological cycle or the hydrologic 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 totemperature 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 influenceclimate.

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 andsedimentation. The water cycle is also essential for the maintenance of most life and ecosystems on the planet.


Processes



Many different processes lead to movements and phase changes in water

PrecipitationCondensed water vapor that falls to the Earth's surface. Most precipitation occurs as rain, but also includes snow, hail, fog drip,graupel, and sleet.[1] Approximately 505,000 km3 (121,000 cu mi) of water falls as precipitation each year, 398,000 km3 (95,000 cu mi) of it over the oceans.[2][better source needed] The rain on land contains 107,000 km3(26,000 cu mi) of water per year and a snowing only 1,000 km3(240 cu mi).[3] 78% of global precipitation occurs over the ocean.[4]Canopy interceptionThe precipitation that is intercepted by plant foliage eventually evaporates back to the atmosphere rather than falling to the ground.SnowmeltThe runoff produced by melting snow.RunoffThe variety of ways by which water moves across the land. This includes both surface runoff and channel runoff. As it flows, the water may seep into the ground, evaporate into the air, become stored in lakes or reservoirs, or be extracted for agricultural or other human uses.InfiltrationThe flow of water from the ground surface into the ground. Once infiltrated, the water becomes soil moisture or groundwater.[5] A recent global study using water stable isotopes, however, shows that not all soil moisture is equally available for groundwater recharge or for plant transpiration.[6]Subsurface flowThe flow of water underground, in the vadose zone and aquifers. Subsurface water may return to the surface (e.g. as a spring or by being pumped) or eventually seep into the oceans. Water returns to the land surface at lower elevation than where it infiltrated, under the force of gravity or gravity induced pressures. Groundwater tends to move slowly and is replenished slowly, so it can remain in aquifers for thousands of years.EvaporationThe transformation of water from liquid to gas phases as it moves from the ground or bodies of water into the overlying atmosphere.[7]The source of energy for evaporation is primarily solar radiation. Evaporation often implicitly includes transpiration from plants, though together they are specifically referred to as evapotranspiration. Total annual evapotranspiration amounts to approximately 505,000 km3(121,000 cu mi) of water, 434,000 km3 (104,000 cu mi) of which evaporates from the oceans.[2] 86% of global evaporation occurs over the ocean.[4]SublimationThe state change directly from solid water (snow or ice) to water vapor by passing the liquid state.[8]DepositionThis refers to changing of water vapor directly to ice.AdvectionThe movement of water through the atmosphere.[9] Without advection, water that evaporated over the oceans could not precipitate over land.CondensationThe transformation of water vapor to liquid water droplets in the air, creating clouds and fog.[10]TranspirationThe release of water vapor from plants and soil into the air.PercolationWater flows vertically through the soil and rocks under the influence of gravity.Plate tectonicsWater enters the mantle via subduction of oceanic crust. Water returns to the surface via volcanism.

The water cycle involves many of these processes.

Answer 2

Water cycle is a process of converting of water vapour into water droplets in the form of rain! Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation. When heat is provided by the sun to the surface of water, it starts converting into water vapour, this process is called evaporation! then after forming cloud by the water vapour it start condensing, the process of converting from gaseous form to liquid is condensation! then, after water droplets (rain fall) enter the earth surface by the process of precipitation!
this whole cycle/process is known as WATER CYCLE!
hope it is helpful!