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Weather satellites have observed a ring of volcanic ash girdling the earth.
Mount Unzen has been spewing out volcanic ash, gas, and rock today.
A cloud of volcanic ash is spreading across wide areas of the Philippines.
Vesuvius blew up and buried Pompeii in volcanic ash.
Bentonite is a naturally occuring clay formed from volcanic ash.
Volcanic ash continued to fall, but in diminishing quantities.
volcanic ash soil
rising volcanic ashes
volcanic ash bed
volcanic ash cloud