Pumice is a highly vesicular (porous) volcanic glass produced during explosive eruptions. It forms when gas-rich, frothy magma cools so rapidly that the gas bubbles remain trapped as holes within the rock. Because it is filled with air pockets, its ...
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The Black Soil (Regur) of India is derived from the weathering of basaltic lava rocks from the Deccan Plateau. These volcanic rocks are rich in iron, magnesium and aluminum. Over millions of years, the chemical decomposition of basalt produces a ...
The Pelean eruption type is geographically significant for producing pyroclastic flows, also known as Nuée Ardente (glowing clouds). These occur when highly viscous magma blocks the vent, leading to a build-up of gas that eventually explodes laterally. These high-speed, incandescent ...
The Soufrière Hills volcano is located on the island of Montserrat in the Caribbean Sea. Its eruption in 1995 buried the capital city, Plymouth and forced the permanent relocation of over half the island’s population. It is a subduction-zone volcano ...
A caldera is a large, basin-like depression formed when a volcano’s summit or flank collapses into an emptied magma chamber. Unlike a crater, which is formed by the explosive ejection of material, a caldera is a structural failure caused by ...