GEOLOGY

Detailed explanation-1: -A volcanic crater is a funnel shaped hollow at the top of the vent. It is formed as lava and gas and ash are blasted upwards from the main vent. Material falls back down to earth around the vent and slowly piles up forming a rim around it.

Detailed explanation-2: -The crater is the bowl shaped opening located at the top of the volcano. The crater is also the steep sided walls made of hardened lava that surround the main vent. Lava can flow from the main vent, but not all volcanoes eject large amounts of lava.

Detailed explanation-3: -Craters at the top of volcanoes are called summit craters. Summit craters are where volcanic material is at or near the Earth’s surface. Volcanoes may have one summit crater, such as Mount Fuji in Japan.

Detailed explanation-4: -Introduction. A volcanic crater is a bowl-or funnel-shaped depression that usually lies directly above the vent from which volcanic material is ejected. Craters are commonly found at the summit of volcanic edifices, but they may form above satellite (flank) vents of composite and shield volcanoes.

Detailed explanation-5: -Magma that has erupted is called lava. Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it.