The Berezniki sinkhole first appeared in 1986 and grows every year. Currently, it's more than 200m (650ft) deep, 80m (260ft) long, and 40m (130ft) wide.

10 Of The Largest Sinkholes In The World

The Berezniki sinkhole first appeared in 1986 and grows every year. Currently, it's more than 200m (650ft) deep, 80m (260ft) long, and 40m (130ft) wide.

Balloon Rockets on Discover Explore Learn - Fun science activity to teach action and reaction. It's a race!

Balloon Rockets on Discover Explore Learn - Fun science activity to teach action and reaction. It's a race!

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