The approximate land surface of the Earth totals more than ________ square kilometers (square miles)
A) 1.5 thousand (579)
B) 15 thousand (5,791)
C) 150 million (50,791,000)
D) 1.5 billion (50,791,000,000)
E) 15 trillion (50,791,000,000,000)
Answer: C
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