Softest mineral

What is the softest of all minerals?
Talc is the softest of minerals. It is commonly used to make talcum powder.

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Lightning per second

How many lightning strikes occur worldwide every second?
On average, about 100. Those are just the ones that hit the ground, though. During any given minute, there are more than a thousand thunderstorms around the Earth causing some 6,000 flashes of lightning. A lot of it goes from cloud-to-cloud.


What is the origin of the word "volcano"?
It derives from Vulcan, the Roman god of fire.

Deepest lake

What is the world's deepest lake?
Lake Baikal in the south central part of Siberia is 5,712 feet (1.7 kilometers) deep. It's about 20 million years old and contains 20 percent of Earth's fresh liquid water.

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