EVERYDAY SCIENCE

Detailed explanation-1: -Lava Domes-Lava domes form where thick (viscous) magma erupts to the surface forming a steep dome-shaped landform. Lava domes can form within a crater of large composite volcano .

Detailed explanation-2: -When magma flows onto Earth’s surface, it always forms volcanic mountains. Almost all volcanoes occur over hotspots within tectonic plates. Volcanoes erupt at mid-ocean ridges. Wherever mantle rock melts, volcanoes may result.

Detailed explanation-3: -The magma rises and collects in chambers within the crust. As magma fills the chamber, pressure grows. If the pressure gets high enough, the magma can break through the crust and spew out in a volcanic eruption. Most explosive volcanoes occur above subduction zones.

Detailed explanation-4: -Most composite volcanoes have a crater at the summit which contains a central vent or a clustered group of vents. Lavas either flow through breaks in the crater wall or issue from fissures on the flanks of the cone.

Detailed explanation-5: -Landform-scale, volcanic geomorphologic features include lava flows and related features (diverse types of scarps, levees, and lava flow surface features); lahars, calderas, the diverse types of cones and related rims, necks, domes, tubes, trenches, fissures and scarps.