1. Water and The Atmosphere - Chapter 1 Lesson 2
Surface Water
Water and The Atmosphere - Chapter 1 Lesson 2

2. Objective Describe the changes that occur in ponds and lakes.
We cover NGSS
MS-ESS2-4 Develop A Model To Describe The Cycling Of Water Through Earth’s Systems By Energy From The Sun And The Force Of Gravity.
MS-ESS3-3 Apply Scientific Principles To Design A Method For Monitoring And Minimizing A Human Impact On The Environment.*
MS-ESS2-4 Develop A Model To Describe The Cycling Of Water Through Earth’s Systems By Energy From The Sun And The Force Of Gravity

3. So Near, So Far
In Colorado’s mountains, some rain seeps into the Fryingpan River.
That river flows into the Colorado River and, more than 2,000 kilometers later, into the Gulf of California.
Less than 15 kilometers away, rain seeps into the Arkansas River, which flows 2,350 kilometers until it joins the Mississippi River.
Eventually, the Mississippi flows into the Gulf of Mexico.
Water that fell less than 15 kilometers apart ends up almost 3,000 kilometers apart, in different oceans!
Why do you think the two rivers that start so close together flow to such different locations?

4. How Can Lakes Change?
Natural processes and human activities can cause lakes to disappear.
When lake organisms die, bacteria break down their bodies and release nutrients into the water.
Over time, nutrients can build up in a lake in a process called eutrophication.
Algae use the plentiful nutrients and grow into a thick layer that blocks sunlight form reaching lake plants.
The lake plants die and the animals that eat them die as well.
Decaying material piles up and the lake becomes shallower and eventually fills in.

5. How Can Lakes Change?
Human activities can cause eutrophication or increase it. Fertilizer in runoff from farmland contains nutrients that increase eutrophication when the runoff enters pond and lakes.
Which of the following processes occurs first during eutrophication?
A.Nutrients build up in a lake.
B.A lake is replaced by a meadow.
C.Plants stop carrying out photosynthesis.

7. How Can Lakes Change?