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Sagot :
Pulverized rock and clastic materials ejected violently during an eruption are called Tephra, or pyroclastics. Regardless of composition, fragment size, or emplacement process, tephra is the fragmented material created during a volcanic eruption.
Lives far from an erupting volcano can be disrupted by falling volcanic ash. All chunks of rock that are propelled into the air by a volcano eruption are referred to as tephra. The majority of the tephra returns to the volcano's slopes, expanding it. But millions of smaller, lighter fragments known as ash, with a diameter of less than 2 mm (less than one hundredth of an inch), are blown thousands of miles by winds. Glacier Peak, Mount St. Helens, and Mount Mazama are three Cascade Range volcanoes that have the capacity to release enormous amounts of volcanic ash, according to evidence from previous eruptions.
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