Which are human systems?

the Amazon Rain Forest

the Appalachian Trail

the George Washington Bridge

the Himalayas

the Hoover Dam

the North American Free Trade Agreement

the San Andreas Fault

the Suez Canal

Which feature do you usually see when tectonic plates move apart? A. mountains B. volcanoes C. earthquakes D. new ocean ridges and seafloor

What are the two main characteristics for ALL igneous rocks?

List the forces of mechanical weathering. (5 of them)

What cities are in area code 213?

What is crude oil (petroleum) and how is it extracted from the earth and refined? What percentages of the commercial energy used in the world and in the United States are provided by crude oil?

Which resources are important to the economies of many countries in Siberian Russia, Central Asia, and the Caucasus region? A. oil B. timber C. diamonds D. coal

In a short paragraph, explain the various waves of immigration to the United States. What groups were part of each of these waves?

What is a fault? A. the name for two opposing forces B. a type of crust that moves under heavier crust C. a crack in Earth's crust where movement occurs D. a volcanic region where new material is being created

How many plug-in hybrids does Obama want to see on the road in the next 6 years? 100,000 500,000 1 million 2 million

What is the difference between weathering and erosion?