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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.

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Lightning bolts strike Earth about 8 million times every 24 hours. That's around 100 lighting strikes each second.

Of the 1,000 active volcanoes on Earth, only 30 of them are known to erupt.

Lava inside a volcano may reach temperatures higher than 1150° C (2100° F). That's hot enough to melt gold.

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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.

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.

Chopping up onions activates a chemical reaction that releases sulfur gas. Water in the human eye reacts with sulfur gas to create sulfuric acid. Although the amount of acid is very small, it's enough to cause a burning sensation in the eye.

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