Ch. 7 Surface Water

Question 1

What can change a lake?

Answer 1

Eutrophication

Question 2

What are streams and smaller rivers that feed into a main river called?

Answer 2

Tributaries

Question 3

Which long rivers flow into the Mississippi River?

Answer 3

Missouri and Ohio rivers

Question 4

Ponds are _______ than lakes.

Answer 4

Shallower

Question 5

Though it occurs naturally, human activities can increase _______.

Answer 5

Eutrophication

Question 6

When a lake is created by the building of a dam, the lake is called _______.

Answer 6

Reservoir

Question 7

A river and all streams and smaller rivers that flow into it together make up a ________.

Answer 7

River System

Question 8

A lake can form when a river is blocked by mud and lava from a _________.

Answer 8

Volcano

Question 9

Algae can overgrow a lake when the lake contains too many _______.

Answer 9

Nutrients

Question 10

Nearly one third of the United States is covered by the Mississippi River _______.

Answer 10

Watershed

Question 11

Something we should know:

Answer 11

When rivers join another river system, the areas they drain become part of the largest river’s watershed.