The most catastrophic volcanic explosions occur when __________ reaches the Earth's surface.

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The most catastrophic volcanic explosions occur when granitic magma, also known as rhyolitic magma, reaches the Earth's surface. This type of magma is thick and viscous, which causes gas pressure to build up rapidly underneath it. When the pressure becomes too great, the magma explodes violently, sending ash, pumice, and other volcanic materials high into the atmosphere. The resulting volcanic ash clouds can cause widespread damage and disruption to air travel, agriculture, and human settlements.

The Most Catastrophic Volcanic Explosions Occur When __________ Reaches the Earth's