GEOLOGY

Detailed explanation-1: -Extinct volcanoes are not expected to erupt in the future. Inside an active volcano is a chamber in which molten rock, called magma, collects. Pressure builds up inside the magma chamber, causing the magma to move through channels in the rock and escape onto the planet’s surface.

Detailed explanation-2: -Answer and Explanation: Volcanoes become extinct when they are cut off from their lava flow, thus not having a source a magma to erupt. They initially become dormant and then extinct. Volcanoes are often formed by the movement of tectonic plates grinding or subducting and shifting upwards.

Detailed explanation-3: -When the magma chamber empties, the support that the magma had provided inside the chamber disappears. As a result, the sides and top of the volcano collapse inward. Calderas vary in size from one to 100 kilometers (0.62 to 62 miles) in diameter. Some calderas form a lake as the bowl-shaped depression fills with water.

Detailed explanation-4: -Molten rock inside Earth is called magma. Lava is molten rock that comes out of volcanoes. When the lava cools down, it forms solid rock.

Detailed explanation-5: -Here’s what that means. New analysis provides a stunning peek into the inner workings-and potential hazards-of volcanoes thought to have long ago gone quiet.