Calderas are some of the most spectacular features on Earth. They are large volcanic craters that form by two different methods: 1) an explosive volcanic eruption; or, 2) collapse of surface rock into an empty magma chamber.The image at right is a satellite view of one of the most famous calderas-Crater Lake in Oregon.enturies of rain and snow filled the caldera creating Crater Lake. With a depth of 1932 feet (589 meters), Crater Lake is the deepest lake in the United States and the seventh deepest lake in the world. Collapse calderas form when a large magma chamber is emptied by a volcanic eruption or by subsurface magma movement.
to be physically sick meaning, to be physically sick definition | English Cobuild dictionary. physical. 1 adj Physical qualities, actions, or things are connected with a person's body, rather than with their mind. ...the physical and mental problems caused by the illness..., The attraction between them is physical.
Restless leg syndrome is one of a group of sleep disorders known as parasomnias characterized by vivid dreams and physical activity. It is a relatively common disorder (seen in 10-15 percent of the general population) that usually affects people over 50.