The Water Cycle (Hydrologic Cycle):

How Water is Naturally Recycled on Earth

Water Cycle and Human impact

Do Now P. 17 Why is it important to take your own

notes? P.17 Tri-foldable Water/nitrogen/carbon cycles in

each blockColor, label, illustrate

Toss n’ read Answer the following questions on a

sheet of paper 1. What are you passionate about? 2. what do you like about Los

Angeles? 3. what do you wish you could do in

order to improve LA and your community?

Video question

You will have guiding questions on the video that follows

Try your best to answer them as the video is only a few minutes long

These will help you with the following activity

LA and water

Article Read Read the article on water and

answer the questions on your worksheet

Review

Transpiration

Evaporation

CondensationPrecipitation

Surface Runoff

Condensation

Lake (body of water)

Groundwater The water that is

filtered through the soil and remains under the ground for plants to use.

Is a major source of drinking water as well as agricultural irrigation.

Human Impact on Water

Look at the picture and list some ways that humans impact the surface water and groundwater.

Human Activities that Impact the Water

Cycle

• Use of toxic chemicals in agriculture and manufacturing and runoff from chemical fertilizers and pesticides can pollute surface water or seep into the ground to contaminate groundwater

• Clear-cutting forests reduces the amount of water plants return to the atmosphere by transpiration.

Oceans

Human Activities Affect the Ocean, Too!

Humans depend on the ocean for food, recreation, trade, travel, and jobs.

Many human activities have modified (changed) the ocean.

Runoff

• Runoff is the excess water that carries pollutants into storm drains and then to the ocean.

• It is an environmental problem for all communities. Residents who live miles inland can contribute to ocean pollution simply by leaving their sprinklers on too long, washing cars at home, or hosing down driveways.

• After this wasted water flows to the curb it carries trash, fertilizers, pet waste and other pollutants into the storm drain system which eventually flows into the ocean.

Runoff

The negative effects of runoff pollution

Sediment can cloud the water and make it difficult for aquatic plants to grow and can destroy aquatic habitats.

Excess nutrients can cause algae blooms. When they die, they decompose in a process that robs the water of its oxygen. Fish can’t live in areas with low oxygen levels.

Bacteria can wash into swimming areas, making beach closures necessary.

Debris such as plastic bags, six-pack bottle rings, and cigarette butts can wash into water bodies and choke, suffocate, or disable ducks, fish, turtles, and birds.

Household hazardous wastes like insecticides, pesticides, paint, solvents, and used motor oil can poison aquatic life.

What can you do?

Recycle or properly dispose of household materials and wastes. Don’t dispose of them in sinks or toilets.

Don’t overwater your lawn or use too many pesticides or fertilizers.

Don’t wash your car at home. Pick up pet waste and dispose of it

properly (flushing).