A caldera is a large depression formed when a volcano erupts and collapses. During a volcanic eruption, magma present in the magma chamber underneath the volcano is expelled, often forcefully. When the magma chamber empties, the support that the magma had provided inside the chamber disappears.
Takes about 10 billion years for a star with the mass of the sun to covert all the hydrogen in its core.
10 billion years.
I’m not entirely sure what is being asked here, but the Tigris and Euphrates rivers is the only place in Egypt (besides the nile delta) with non-arid ground. That’s why most people live around there:
A) Ha crecido rápidamente en los último siglo.
D. along rivers and streams
