1. The Water Cycle
The Hydrologic Cycle

2. The Water Cycle
Constant movement of water through earth and atmosphere
Steps are repeated regularly over and over
Water changing from 3 states because of the sun

4. The Water Cycle
Responding to heat energy from the Sun, water in oceans, lakes, swamps, rivers, plants and even in your body can turn into water vapor.
Water vapor in the atmosphere condenses as it cools to form clouds.
Once the droplets of condensed water vapor are too heavy to remain in the atmosphere, they fall to Earth as precipitation. Rain, snow, sleet, fog and dew are all forms of precipitation.
After the precipitation reaches the surface of Earth, it does one of four things. It can:
be absorbed by plants
become ground water
run off the surface into streams and rivers--becoming surface water and eventually flowing into the oceans,
evaporate

5. Words to Know
Accumulation - the process in which water pools in large bodies (like oceans, seas and lakes). Condensation - the process in which water vapor (a gas) in the air turns into liquid water. Condensing water forms clouds in the sky. Water drops that form on the outside of a glass of icy water are condensed water. Evaporation - the process in which liquid water becomes water vapor (a gas). Water vaporizes from the surfaces of oceans and lakes, from the surface of the land, and from melts in snow fields. Precipitation - the process in which water (in the form of rain, snow, sleet, or hail) falls from clouds in the sky. Subsurface Runoff - rain, snow melt, or other water that flows in underground streams, drains, or sewers. Surface Runoff - rain, snow melt, or other water that flows in surface streams, rivers, or canals. Transpiration - the process in which some water within plants evaporates into the atmosphere. Water is first absorbed by the plant's roots, then later exits by evaporating through pores in the plant.

6. Review Question
Describe the steps required for water in a lake to fall as rain onto an area of land. Be sure to include the changes that happen to the water in each step.
Water in the lake changes from liquid to gas in the air when warmed by the sun. The water in the air changes back into liquid water and forms clouds because the water is cooled as it moves higher into the atmosphere. Water droplets in the clouds fall onto the land as rain.

7. Videos for extra help Bill Nye
Colorado State University Educational Video
Study Jams