The main hazard of an eruption that forms a large caldera is
A) burning, building collapse, and suffocation from an eruption column and pyroclastic flows.
B) volcanic mudflows and landslides.
C) hot fragments thrown a short distance from the volcano.
D) destruction by moderately fluid lava flows that can flow far from the volcano.
A) burning, building collapse, and suffocation from an eruption column and pyroclastic flows.
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Which list of items contains only ions?
a. CO2, H2O, Na+, H- b. Na+, H-, Pb, Hg c. Pb, Hg, CO2,NaCl d. Cl-, Na+, Ca2+, NO3- e. NaCl, NO, CO, NaOH
What has been attributed to the deadly viral epidemic among dolphins in the western Mediterranean?
a. DDT b. Refined oil spills c. PCBs d. CFCs
The U.S. Department of Energy predicts that in 2040 the average American will use ________ energy as compared to today. This is primarily due to ________
A) less; global warming B) less; more energy-efficient appliances, homes, and vehicles, and migration to warmer areas C) less; shorter commute distances and more energy-efficient buildings D) more; larger homes E) less; more people working from home
The ________ describes the process in which this dominant greenhouse gas circulates among Earth systems.
A. helium cycle B. calcium cycle C. potassium cycle D. carbon cycle E. sodium cycle