Volcanoes cool Earth's surface because their suspended aerosols reflect sunlight.

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Volcanic aerosols can remain suspended in the atmosphere for months to years and reflect sunlight back into space, leading to a cooling effect on Earth's surface. This can be observed after major volcanic eruptions, such as the 1991 eruption of Mount Pinatubo in the Philippines, which caused a temporary cooling of about 0.5°C globally.

Volcanoes Cool Earth's Surface Because Their Suspended Aerosols Reflect Sunlight