(CNN) — Here's some background information about volcanoes, mountains that open downward to a reservoir of molten rock. Facts: More than 80% of the Earth's surface, both above and below sea level, is ...
Deep in the Sierra del Divisor on the Peru-Brazil border rises El Cono, a striking 400-meter peak that has fueled claims of a lost pyramid in the Amazon. The transcript examines both sides of the ...