What Is a Permitted Year

question 42

Short Answer

What is a permitted year?

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Definitions:

Igneous Rock

A type of rock that forms through the cooling and solidification of magma or lava, with examples including granite and basalt.

Pyroclastic Eruption

A volcanic phenomenon involving the expulsion of hot gases, ash, and volcanic debris.

Dissolved Gas

Gases that are incorporated into magma and can expand, leading to explosive volcanic eruptions as pressure decreases.

Rhyolite

A mostly fine-grained, felsic igneous rock, generally of volcanic origin; can contain glass, volcanic ash, pieces of pumice, and variable amounts of visible crystals (phenocrysts).