The Sahara desert expands at about 1km per month.
90
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
41
Australia's Great Barrier Reef is 1,250 miles long!
45