In a region bursting with people, a few big open Spaces remain-like the Rift floor in Queen Elizabeth Park, pocked with crater lakes formed by volcanic explosions.
Kurile Lake was formed 8300-8400 years ago by a large volcanic explosion and a collapse of the Earth crust.
The researchers examined Martian meteorites here on Earth to determine that the sulfur and chlorine likely resulted from ancient volcanic explosions.
A large crater formed by volcanic explosion or by collapse of a volcanic cone.
