Mr. Burton 2.2 notes

Please Grab:1. Your folder.2. Writing Utensil.3. Answer the following question: How much of the earth do you think water covers? (Percentage, fractions, etc.)

Water

Water covers some two-thirds of the planet.

About 97 percent of the Earth’s water

Unsafe to drink because of high levels of salt

In general, found in Earth’s oceans, which cover some 71 percent of the planet’s surface

Also found in some of Earth’s lakes

Water without salt

Makes up only 3 percent of our water supply

Freshwater Much of Earth’s freshwater is locked in glaciers, large areas of slow

moving ice, and in the ice of the Arctic and Antarctic regions. Surface water is water that is found in Earth’s streams, rivers, and

lakes. Less than one percent of Earth’s water supply Streams, rivers, and lakes are common sources.

Precipitation is water that falls to Earth’s surface as rain, snow, sleet, or hail. Streams form when precipitation collects in a narrow channel and flows

toward the ocean.

Most available freshwater is groundwater, water found below Earth’s surface. Some naturally bubbles from the ground to the surface as a spring. Most obtained by digging wells

The Water Cycle

Water is the only substance on Earth that occurs naturally as a solid, a liquid, and a gas, or water vapor.

The water cycle is the movement of water from Earth’s surface to the atmosphere and back ; it is driven by the sun’s energy.

Evaporation—water turns from liquid to gas.

Condensation—the rising gas cools and condenses, or changes from a vapor into tiny liquid droplets, to form clouds.

Precipitation—if the droplets in clouds become heavy enough, they fall back to Earth as rain, snow, sleet, or hail.

Runoff—excess water that isn’t absorbed as groundwater flows over land and collects in streams, rivers, and oceans.

Water Cycle pic.

Importance of water

Lack of available freshwater, which can be caused by droughts or overuse

Contaminated, or polluted, water can harm humans, plants, and animals.

Flooding can damage property and threaten lives.

Provides us with food to eat

Important source of energy

Provides us with recreation, including swimming, fishing, surfing, and sailing

Exit Slip

Post-it: What’s the MOST important item you learned today and what is one question you still have.

Have a great remainder of the day.