D. Twenty countries whose people share a common religion and cultural heritage
A volcano with an empty magma chamber would be called a caldera
Explanation: During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.
The Caucasus Mountains are found between the Black and Caspian Seas.
We would be looking for a rather small country with a relatively population. It would also probably not include land that is relatively uninhabitable: mountains or jungle or deserts.
The correct answer is: Ecuador. Its population is 16 million and the population density is 55 people per square kilometer.
It is true, countries like Kosovo and Bosnia-Herzegovina can be put under this category despite not having a coastline on the Mediterranean.
