What is this process called?

Gas molecules

Liquid molecules

How much of Earth’s surface is covered by salt water?• 3/4

Distribution of Earth’s Water• Only three percent of Earth’s water is

fresh water.

- Water on Earth

Most of our freshwater is what form?

A puddle drying up on a sunny day is an example of what?

• Evaporation

Precipitation occurs when …

• solid or liquid water falls from clouds.

Clouds are an example of what process in the water cycle?

• condensation

• fresh water

What kind of water is cycled through the water cycle?

Most of earth’s freshwater is found in

• frozen icebergs and glaciers.

Section 1.2Fresh Water Flows and

Freezes on Earth

What is a divide?• A ridge, or

continuous line of high land, from which water flows in different directions

What is a drainage basin?• An area into which all of the water on

one side of a divide flows.

Gravity and the drainage basin is going to determine the way water flows on land.

• Where is the divide?

• Where is the drainage basin?

Where is the divide? Where is the drainage basin?

Surface water collects in

A. Clouds

B. Aquifers

C. Streams

D. Lakes

Name two differences between a pond and a lake

1. A lake is bigger than a pond2. Sunlight reaches the bottom of a

pond so that plants grow throughout the pond.

Lakes are larger, deeper & have little plant growth

Ponds are smaller, shallow, and have more plant growth

What time of the year is this?

Warm water

Cold water

During the summer, the warm surface water of a lake does not mix with the

cooler water underneath it. In the fall, though, this warm layer cools and sinks. This sinking is part of lake

_____________. • turnover

Eutrophication of a lake or pond can result from what?

• buildup of dead organisms. • pollution from phosphate detergents. • run-off of nitrogen fertilizers.

What is an iceberg?• A mass of ice floating in the ocean

Why does an iceberg float on water?•Because ice is less dense than water

A. Below the ground surface

B. Above the ocean surface

C. Below the ocean surface

D. None of the above

Most of the volume of an iceberg is

What is groundwater?

Video Clip

• How is water collected underground?

• Why are aquifers important?

Which of the following is not true of aquifers?

A. They filter and clean water.

B. Water flows quickly through them.

C. They provide a source of water for people.

D. They can be emptied.

Rate of water flow through an aquifer.

In an aquifer, water is stored in

A. an underground lake.

B. cracks and spaces between rocks.

C. an underground river.

D. wells and springs.

Granite does not allow water to flow through it. Granite is an example of

A. a spring.

B. impermeable rock.

C. an aquifer.

D. permeable rock.

What is an artesian well?• A well in which water flows to the surface

naturally because it is under pressure.

• It does not need to be pumped out.

Water exists in 3 states of matter on Earth!!!

- The Properties of Water

Changing State- The Properties of Water

One drop of water could contain many living bacteria

Lakes are homes for many fish, plants, frogs

2/3 of your body is water

Water carries nutrients that give you energy & flushes wastes away