GEOLOGY

Detailed explanation-1: -The Volcanic Eruption of Mt. Tambora. A 13, 000-foot-high volcano on the island of Sumbawa, near Bali, Indonesia, was the primary cause of the Year Without a Summer. The eruption happened in April of 1815 and was one of the greatest volcanic eruptions in history.

Detailed explanation-2: -Mount Tambora ejected so much ash and aerosols into the atmosphere that the sky darkened and the Sun was blocked from view. The large particles spewed by the volcano fell to the ground nearby, covering towns with enough ash to collapse homes.

Detailed explanation-3: -The 1883 eruption of Krakatoa caused average Northern Hemisphere summer temperatures to fall by as much as 1.2 °C (2.2 °F). One of the wettest rainy seasons in recorded history followed in California during 1883–84.

Detailed explanation-4: -Though no one realized it at the time, we now know that Tambora’s eruption was the major cause of the following year, 1816, being cooler than average across the Northern Hemisphere.