1. Alaska is the _____ state.

a. warmest summer
b. hot springs
c. only island
d. largest and most northern

2. The source of the Rio Grande begins _____.

a. where two plates collide
b. as a small tributary
c. as melting snow in the Rocky Mountains
d. at the Great Salt Lake

3. Earthquakes happen quite often along _____.

a. the Rocky Mountains
b. the Pacific coast
c. the Great Salt Lake
d. Yellowstone National Park

4. Plants and animals have learned to _________ in order to survive different environments.

a. adapt
b. resist change
c. hibernate
d. migrate

5. How were the Rocky Mountains formed?

a. volcanoes
b. two plates collided
c. erosion
d. glaciers

6. The Great Salt Lake is too salty for most fish, but many _________ live there.

a. shrimp
b. lobsters
c. crabs
d. clams