Which statement about the May, 1980, eruption of Mount St. Helens is false?
A) The most powerful explosive event was preceded by a massive landslide.
B) Plumes of ash rose high into the atmosphere during the major eruptive events.
C) During the eruptive period, the mountain peak was substantially built up by new lava flows and pyroclastic debris.
D) Mudflows accompanied the major eruptive events.
C
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A sediment layer in which grain size decreases from the bottom up:
a. graded bedding d. drift b. mud cracks e. till c. bioturbation
Which of the following is associated with a passive continental margin?
A) Divergent boundaries B) Convergent boundaries C) Transform boundaries D) No tectonic boundaries nearby
The primary aim of the Clean Air Acts is to ____.
A. set standards for pollution levels B. require screening of new products for safety and setting standards C. encourage resource conservation D. set aside or protect certain species, resources, and ecosystems E. require evaluation of the environmental impact of an activity proposed by a federal agency
Cloud droplets begin forming on ________
Fill in the blank(s) with the appropriate word(s).