Module 1 Lessons 21-24

What are huge man-made structures that act as barriers on a river called?

• landforms

• dams

• maps

• canyons

Dams are built on ________ so that the water in the river can be controlled.

• rivers

• canyons

• landforms

• volcanoes

Most dams have ________ that can be opened and closed to safely release water.

• locks

• windows

• gates

• wheels

When a dam is built, _______ backs up behind the dam.

• sediment

• branches

• lava

• water

Over time, the pool of water behind the dam will build up creating a man-made ______.

• lake

• island

• valley

• river

A dam can also slow down the amount of water that flows in _________ of the dam.

• behind

• front

• the top

• the bottom

The dam can slow down the amount of water that flows in front of the dam causing rivers that flow downstream to _______.

• fill up

• overflow

• dry up

• flood

What is the main reason people build dams?

• produce gas

• produce electricity

• produce oil

• produce coal

In hydroelectric dams, the water moving through the dam spins a turbine to generate ______________.

• oil

• coal

• gas

• electricity

Which is not a reason dams are built?

• to collect water for drinking

• to collect water for farmland

• to flood the land

• slow down fast rivers

• prevent flooding