Usually, air gets colder as you go higher. In an “inversion,” a layer of warm air sits on top of a layer of cold air. This acts like a lid on a pot, trapping smog, smoke and moisture near the ...
Discussion Forum Latest Questions
Tephra is a general term for all fragmented material produced and ejected into the air during a volcanic eruption. This includes everything from fine volcanic ash and dust to medium-sized lapilli and large volcanic bombs. Once tephra falls to the ...
A Meander is a landform created by fluvial (river) action, not volcanic activity. It refers to the winding curves or bends in a river’s course caused by erosion and deposition. Sills, dikes, lava plateaus and lava plains are all formed ...
A Fjord is not related to volcanic activity; it is a glacial landform. It is a long, narrow, deep inlet of the sea between high cliffs, formed by the submergence of a glaciated valley. Craters, calderas and geysers are all ...
Water vapor (H2O) is the most abundant gas released during a volcanic eruption, typically accounting for 80 to 90 percent of the total gas volume. It comes from water that was trapped in the minerals of subducting plates and then ...