Which of the following elements produces no harmful emissions when used as an energy source? A. coal B. oil C. wind D. natural gas

over the last 250 million years, the world changed from a single land mass to a number of different continents. One reason for the change is expanding ocean floors. What causes ocean floors to expand?

Today the majority of governments in the peninsula are

The Earth has four main seasons: winter, spring, summer, and fall. Which of the following is a cause of seasonal changes on Earth? The Earth rotates. The Earth's axis is tilted. The Earth revolves around the Sun.

The particular animals of given geographic region are called its

Describe China's "One Child Policy."

1. Describe the most important diagnostic properties in igneous rocks. 2. What minerals would you expect to form in basalt? (Hint: Consider composition and Bowen's reaction series). Explain your answer.

What is the most important role of the ecosystems of the Andes? A. Keep the environment stable and reduces air pollution B. Reduce the chance of floods, desertification, and landslides C. Regulate the availability of freshwater D. All of the above

All of the following are examples of thematic maps except:

Which is used by scientists as evidence that Earth's inner core is solid? O A. S waves cannot travel through the inner core, creating a shadow zone. O B. Seismic waves change speed when they go from the inner core to the outer core. O C.

What role did geography play in the early African kingdoms? Volcanic eruptions scared away attackers. Mineral deposits brought wealth and power. The Great Rift separated them from the continent. Tropical storms extended the growing season.