David Fee studies sound waves so deep and low that humans cannot hear them. What are these low frequencies called?
Fill in the blanks to describe the work of Ben Kennedy, a volcanologist who works in New Zealand.
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bubbles
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tension
Use the drop-down menus to complete each statement about Steven Businger’s work with volcanoes in Hawaii.
research database✔ computer model research paper
sulfur carbonate carbon dioxide ✔ sulfur dioxide
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