Longest cave

The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!

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Amazon rainforest oxygen supply

The Amazon rainforest produces more than 20% the world's oxygen supply.

Gold in seawater

One cubic mile of seawater contains about 50 pounds of gold.

Siberia's Forest

More than 25% of the world's forests are in Siberia.

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