Due to their unstable environments, some crater lakes exist only intermittently.When water from rain or melted snow gets accumulated in the caldera, it becomes a caldera lake (in general, the caldera lakes are also called crater lakes).The volcanic material above the chamber collapses into the empty magma chamber, and the collapsed surface appears like a large cauldron-like hollow (tub shaped) called the caldera.In some volcanoes, the magma chamber below the surface may be emptied after volcanic eruptions. ![]() When water from rain or melted snow gets accumulated in the crater, it becomes a crater lake.When the volcano is not active the crater appears as a bowl-shaped depression. A crater is an inverted cone-shaped vent through which the magma flows out.Example: Siberian Traps, Deccan Traps, Snake Basin, Icelandic Shield, Canadian Shield.Sometimes, a very thin magma escapes through cracks and fissures in the earth’s surface and flows after intervals for a long time, spreading over a vast area, finally producing a layered, undulating (wave-like), flat surface.Example: Hawaiian volcanoes Mauna Loa (active shield volcano) and Mauna Kea (dormant shield volcano).įissure Type Flood Basalt Landforms (Lava Plateaus). ![]()
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