Water cycle


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Water cycle

  1. 1. Water Cycle What is Water ? • Water is a liquid at standard ambient temperature and pressure. • Water covers 71% of the Earth's surface, and is vital for all known forms of life. What is Cycle? • It means continous. Like a circle with no end. What is Water Cycle? • The water cycle, also known as the hydrologic cycle or the H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth. Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go, in and out of the atmosphere. Precipitation • Condensed water vapor that falls to the Earth's surface . Most precipitation occurs as rain, but also includes snow, hail, fog drip. • RAIN - is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated • SNOW - form of flakes of crystalline water ice that fall from clouds. • HAIL -It consists of balls or irregular lumps of ice, each of which is called a hailstone. • FOG DRIP - forms when fog droplets condense on the needles or leaves of trees or other objects, and drip to the ground. Evaporation • is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. • Evaporation is an essential part of the water cycle. The sun (solar energy) drives evaporation of water from oceans, lakes, moisture in the soil, and other sources of water.
  2. 2. Condensation • Condensation is the change of the physical state of matter from gaseous phase into liquid phase, and is the reverse of vaporization. OTHER parts of the Water Cycle Runoff • The 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. Transpiration Transpiration is the process of water movement through a plant and its evaporation from aerial parts especially from leaves but also from stems and flowers. Leaf surfaces are dotted with pores which are called stomata, and in most plants they are more numerous on the undersides of the foliage. Infiltration • The flow of water from the ground surface into the ground. Once infiltrated, the water becomes soil moisture or groundwater.
  3. 3. Percolation Percolation is a hydrologic process where water moves downward from surface water to groundwater. This process usually occurs in the vadosezone below plant roots and is often expressed as a flux to the water table surface.