What is the difference between a pyroclastic flow and a pyroclastic surge (aka surges)?
What will be an ideal response?
Answer: A pyroclastic flow consists of hot gas, ash, and larger lava fragments. A pyroclastic surge consists of hot gas and minor amounts of ash.
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Wolves were reintroduced to the Yellowstone ecosystem in ____.
A. 1620 B. the 1920s C. 1954 D. 1995 E. 2003
The Smithsonian obtained many specimens and artifacts from which groundbreaking hybrid
expedition? a. The Discovery Expedition b. The Resolution Expedition c. The United States Exploring Expedition d. The Challenger Expedition
What is one of the components of a sustainability revolution?
A. population stabilization B. consume and throw away C. fossil fuels as a primary energy source D. high resource utilization E. reduced biodiversity
What is the cold water phase of ENSO?
A. the Walker Circulation B. El Niño C. La Niña D. the PDO E. the NAO