or blocky, coagulated lava flow. These eruptions produced pyroclastic surges that went down as far as 3800 meters altitude.

Surveys and expeditions

Until the beginning of the 19th century, it was thought that Chimborazo was the highest mountain on Earth (measured from sea level), and such reputation led to many attempts on its summit during the 17th and 18th centuries.

In 1746, the volcano was explored by French

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