The answer is a political system
Pretty sure it's outer core, lower mantle because the inner core is solid iron
The name for such a hole is "caldera" which is a word of Spanish origin meaning "a pot" or a "cooking pot" (thing of cauldron!) - and this word is used because it resembles the shape of this hole.
Often the Calderas are filled with water forming lakes and often there is an island in the middle of the water.
Answer:
WagonR use Fossil evidence to support his continental drift hypothesis the Fossil of this organism are found on less that are now for apart groups and rock deposits left by insteon Glacier are found today on different continents very close to the equator
