Which statement best explains the main purpose of this man-made object?

• bridge a river.

• generate electricity..

• prevent flooding.

• make clean water.

Which statement best describe this change made to the walls of the Grand Canyon?

• stop the rock from wearing down.

• protect wildlife

• . remove useful minerals.

• provide hiking trails.

Based on the picture, how have people changed the land surrounding the Mississippi River? 

• People have dug canals to irrigate fields.

• People have built deep wells so they can use oil and natural gas.

• People have dug mines so they can get salt and clay.

• People have flattened the land so they can travel and build houses.

Why is wheat grown mainly in the Great Plains, in the western part of the Midwest?

• because the coastal soil in the western part of the region is well suited to wheat.

• because wheat will grow well in the drier western part of the Midwest

• because there is more rainfall in the Great Plains than the Central Plains

• because most states in the eastern part of the Midwest do not allow farmers to grow wheat

Part of the Midwest is often called ________ Alley because this type of extreme weather is both common and dangerous. 

• Tornado

• Hurricane

• Tsunami

• Blizzard

Along with enough rainfall to raise crops, rich soil, and level ground, what else helps make the Midwest one of the most productive farming regions in the world?

• cool summer temperatures

• a long growing season

• inexpensive labor

• a large amount of extra land

In addition to the lumber used to make wood products, what’s another resource that comes from forests in the Northeast?

• maple syrup

• gold

• oranges

• hydroelectric power

How do people prevent the Mississippi River from overflowing and flooding the riverbanks?

• Levees have been placed along the Mississippi River in case of floods.

• The National Weather Service lets people know when winds have reached 74 miles per hour.

• The American Red Cross helps people evacuate their neighborhoods.

• The National Weather Service lets people know when the water level rises.

Which two natural resources are found in the Gulf of Mexico?

• oil and gold

• natural gas and silver

• oil and natural gas

• copper and natural gas

Using the map, Alaska has a very low population because of its _______.

• large land area.

• harsh climate.

• natural resources.

• political system.