A chaotic mixture of volcanic ash and rock fragments that is left behind when most of the gas escapes into the atmosphere during an ash flow and solidifies is called a/an __________ __________ __________.
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Q7: About 75 percent of the Earth's volcanic
Q8: _ are pyroclastic volcanic fragments that vary
Q9: The circular depression left when the roof
Q10: The Ring of Fire, a zone of
Q11: Granitic magma contains _ water than basaltic
Q13: Typical granitic magma contains _ silica and
Q14: A/an _ forms when magma oozes between
Q15: Magma production occurs through _ _ _
Q16: Melting caused by decreased pressure is called
Q17: Granitic magma has a _ melting temperature
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