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Volcanic ash can remain floating in the air for days. An ash cloud could potentially block out the sun over an area for quite some time. With no sun, plants die. With no plants, things that eat plants die. Then the things that eat those things die, and so on. Plants can also be killed by toxic components of the ash enterting the soil. Also, if inhaled, volcanic ash can cause respiratory disease, such as pneumonoultramicrosopicsilicovolcanoconiosis (caused by microscopic bits of volcanic ash finding its way into the lungs) and other complications.

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