The approximate land surface of the earth totals more than ________ square kilometers (square miles). the approximate land surface of the earth totals more than ________ square kilometers (square miles). 15 thousand (5,791) 1.5 billion (50,791,000,000) 15 trillion (50,791,000,000,000) 150 million (50,791,000) 1.5 thousand (579)