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The Pacaya volcano is a part of the Central American Volcanic Arc, a chain of volcanoes stretching from the northwest to the southeast along the Pacific coast of Central America, formed by the tectonic subduction of the Cocos Tectonic Plate beneath the Caribbean Plate.
Spatter cones form when blobs of molten magma that are ejected from a vent by mild explosions solidify around the vent and form a steep-sided cone. This small spatter cone formed in MacKenney crater of Pacaya volcano in Guatemala on February 10, 1985. This was part of an ongoing eruption of Pacaya that began in 1965.