Which of the following represent human systems?

1. Cascade Tunnel

2. coal mines

3. Rocky Mountains

4. the Erie Canal

5. Lake Superior

What makes the Nile river unique from every other river in the world

Why is it that in the USA, tornadoes occur mainly during the summer and also in the afternoons?

What object became the principal object of worship among the Arabs?

How many african countries does the tropic of capricorn cross

In capitalism why is the desire to consume a good thing

Russia's population distribution is strongly influenced by ... a. the demands of world trade. b. its ethnic and religious diversity. c. the Pacific Ocean. d. its physical environment.

Which of the following was a contributing factor to the spread of the Depression around the world?

What determines the size of a mineral crystal formed from magma?

European colonists in the Caribbean build large sugarcane plantation. true or false.

The hypothesis that a single large landmass broke up into smaller landmasses to form the continents, which then drifted to their present location