Water Chapter 11 Section 1 Objectives How does

Water Chapter 11, Section 1

Objectives • How does the location of water on the Earth’s surface and the condition of the atmosphere affect its path through stages of the water cycle? • How does the amount of saltwater differ from the amount of freshwater on the earth? • How does the water continually move through the water cycle?

Earth’s Water -71% of Earth is made up of Water. 97% of the Earth’s water is salt water that is found in oceans.

Fresh Water on the Earth • 3% of the Earth’s water is fresh water. • Less than 1% of all the water on Earth is fresh water that humans can use.

Location of Fresh Water Available for Human Use: • Ice masses near the Poles • Rivers and Lakes • Water Vapor in the Atmosphere • Below the Earth’s surface (groundwater) (More fresh water is located underground than in the Earth’s Rivers and lakes. )

Water Cycle • The Water Cycle is the continuous process by which water moves through the environment.

Energy Source for the Water Cycle: • The sun is the source of energy that drives the water cycle.

Water Cycle Processes: • Evaporation • Condensation in Clouds • Precipitation • Runoff • Transpiration • Percolation/infiltration

Water Cycle Processes: • Evaporation: The process by which molecules at the surface of a liquid absorb enough energy to change to a gaseous state. (Molecules of water escape from a puddle, a lake, a stream, or a droplet of water. )

Water Cycle Processes: • Condensation: Clouds form as the water vapor cools.

Water Cycle Processes: • Precipitation: As more water vapor condenses, the water droplets in a cloud eventually become so heavy that they fall back to Earth.

Water Cycle Processes: • Runoff: When precipitation falls on land, some runs off the surface of land into rivers and lakes.

Water Cycle Processes: • Transpiration: When plants release water to the air.

Water Cycle Processes • Infiltration/Percolation: water soaks back into the ground like water in a sponge.

Where do we get our freshwater?

Water Pollution