Simplify the following text for a Grade 7 native English-speaking person.
Original: With less than 3 % of Australia 's land area it produces more run-off than all of Australia south of the Tropic of Capricorn .
Simplified: Indeed , with only about 2.7 percent of Australia 's land area it produces more run-off than all of Australia south of the Tropic of Capricorn .