In 1883 the world was covered by volcanic ash, causing an effect known as "the equatorial smoke cloud." The ash was produced in Indonesia by the world's biggest volcanic chain eruption ever.
1816 is known as "The Year Without Summer." Failed crops caused famines across the globe. The cold weather was caused by a massive eruption of mount Tambora in Indonesia.
Earth's tectonic plates move slowly. Some move as fast as human fingernails grow (1 inch/year), while others may move up to 3 times faster.