The average ice berg weighs 20,000,000 tons!
54
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The North Atlantic gets 2.5 centimetres (1in) wider every year.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Every year, Alaska has about 5,000 earthquakes.
31
Israel's Dead Sea is 1,312 feet below sea level.
48
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
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