What causes caldera to form?
Magma often empties from a chamber beneath a volcano. When the land around the crater collapses, a caldera is formed.
No, Mount Vesuvius is a composite volcano and its latest eruption was in 1944. Some sources say that in that eruption, Mt. Vesuvius collapsed in a caldera, but it didn't. FYI: A caldera is a volcano that had an extremely explosive eruption that emptied the magma chamber, causing the volcano to collapse in on itself. An example of a caldera is Crater Lake in Oregon.
There are two may ways volcanoes can form lakes. First, the slopes of volcanoes are often unstable and prone to landslides. Landslides can create natural dams in rivers and streams, which in turn can create lakes. Second, after a particularly large eruption, some volcanoes collapse and form a depression called a caldera. Rainwater and snowmelt can collect in a caldera to form a lake.
A caldera is the depression atop a volcanic landform, either active or dormant. It can be very large and becomes less visible after a long period of erosion. A crater lake forms when the surface of the caldera is impermeable rock, and there is no way for precipitation to drain. On high mountains with glaciers, small lakes can form seasonally from meltwater.
A caldera is a large crater, up to 50 kilometers, that can form when the summit or side of a volcano collapses into the magma chamber during of after an explosion. A crater is an indentation, only up to 1 kilometer in diameter, that forms around the central vent at the summit of a volcano. The main difference is size.