How do volcanic bombs differ from blocks of pyroclastic debris?
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Particles larger than 64 millimeters in diameter are called blocks when they are made of hardened lava and bombs when they are ejected as incandescent lava. Because bombs are semimolten upon ejection, they often take on a streamlined shape (like a football) as they hurtle through the air.
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What do scientists call the average number of years between floods of the same size?
A. Discharge interval B. Flood stage C. One year D. Recurrence interval
Which of the following is most porous?
A)sand B)soil C)gravel D)silt E)clay
Discuss the important factors that lead to the formation of waterspouts
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In the open ocean, what is the correct order of pelagic zones from surface to bottom?
a. mesopelagic, bathypelagic, abyssopelagic, epipelagic b. abyssopelagic, bathypelagic, mesopelagic, epipelagic c. epipelagic, mesopelagic, abyssopelagic, bathypelagic d. epipelagic, mesopelagic, bathypelagic, abyssopelagic e. abyssopelagic, bathypelagic, mesopelagic, epipelagic