3Arguably the most important natural phenomenon on Earth, the water cycle, also known as the hydrologic cycle, describes the constant movement and endless recycling of water between the atmosphere, land surface, and under the ground. The hydrologic cycle supplies the force needed for most natural processes, thus supporting life itself.
5The Water MoleculeH20 consists of one atom of oxygen bound to two atoms of hydrogen. The water molecule has a positive charge on the side of hydrogen atoms and a negative charge on the other side. Water molecules tend to attract each other because the positive ends attract to the negative ends.
6Water is a “universal solvent: and wherever it goes throughout the water cycle, it takes up valuable chemicals, minerals and nutrients.
7CondensationThe change from a liquid to a gas. In the water cycle, the change from water to water vapor.
8Condensation & Convection Warm air risesAir cools and can no longer hold vaporProcess known as CONVECTION
9Condensation & Cloud Formation Cooling of water vapor forms CLOUDSOther ways clouds are formedConvergenceLifting of air by fronts
11SnowSnow is a type of precipitation like rain but at cooler temperaturesUsually reaches the ground and staysEventually melts and becomes runoff in streams
12Rain Type of precipitation during warmer weather Occurs when clouds become too fullFalls to earth in the form of water and runs off to streams & rivers
13Freshwater StorageWater may be stored temporarily in the ground, oceans, lakes, rivers, and ion ice caps and glaciers.
14The world’s two main reservoirs of fresh water are the great polar ice caps, and the ground. If all of the ice in the ice caps and other glaciers melted, it would raise the sea level by about 260 ft.
15In temperate climates, water is found in depression storage or surface water puddles, ditches, and anywhere else that runoff water can gather. This is a temporary form of storage
29- water seeps downward underground into soil and rock crevices -then stored underground in rock crevices and in the pores of geologic materials that make up the Earth's crust
30-Water storage under the ground largely depends on the geologic features related to the types of soil and the types of rocks present at the storage locations.-underground storage occurs in the soil, in aquifers, and in the crevices of rock formations
31Evaporation Conversion of water from a liquid into a gas Water transferred from surface to atmosphere through evaporation
37Transpiration Cont. Environmental factors that affect transpiration: LightTemperatureHumidityWindSoil water
38Good For Plants!!Transpiration is the “engine” of plant life, pulling water up from the roots. This allows for photosynthesis, brings minerals from the roots to the rest of the plant, and cools the leaves.
40-atmosphere holds only very small percentage of Earth’s water supply at any given time -rapid recycling of water must occur between earth's surface and atmosphereWorld Water SupplySource% of SupplyOceans97.08Ice Sheets and Glaciers1.99Ground Water0.62Atmosphere0.29Lakes (Fresh)0.01Inland Seas / Salt Water Lakes0.005Soil Moisture0.004Rivers0.001
41- Water stored in the atmosphere can be moved relatively quickly from one part of the planet to another part of the planet