Craters are formed by the outward explosion of rocks and other materials from a volcano. Calderas are formed by the inward collapse of a volcano's magma chamber. Craters are usually much smaller features than calderas, and calderas are sometimes considered giant craters.
C) Craters are formed by ejecting material during volcanic explosions while calderas are formed from inward collapse of volcano tops during explosive eruptions.
<h2>Explanation:</h2>
Calderas form when the volcanic eruption or the eruption of lava creates a huge empty magmatic chamber below the surface of the earth which later form a depression due to collapsing back into the chamber.
Calderas are not visible with a naked eye; they can only be seen on images taken from out of space. An example of the gigantic caldera is Yellowstone National Park. Craters, however, results from volcanic eruptions which cause vents were magma and other material escapes to form a cone shape. An example is Mt. St Helen.
"A system of temporary reference points established in the field allows users to move freely within the study area without losing the geo-referencing. It allows the user to perform the mapping of trees, deadwood, transects, repeated measurements and data verification."
