Puzzle for November 18, 2008

This is National Geography Awareness Week

Population density is the number of people per unit of area usually per square kilometers (or square miles)(which may include or exclude cultivated or potentially productive area).

The world population is 6.7 billion, and Earth's area is 510 million square kilometers (200 million square miles) across the whole planet or about 150 million square kilometers (58 million sq mi) of land mass.

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