
20. Volcano Ash Clouds
Despite the beauty of this monstrosity, it’s quite deadly. Depending on the size of the ash cloud, it can cause a major worldwide disruption. Volcanic ash is a combination of splintered rock that’s shattered by the explosion, and frozen liquid magma. Ash clouds consist of very fine particles, and can reflect sunlight back into space. They’re deadly to aircraft because of their fine composition, and their reflective quality cools the planet, having adverse effects. 1815 was the “year without a summer,” triggered by the ash cloud from Indonesia’s Mt. Tambora (via The Travel).