Question

Which of the following statements is true about Earth?A. Earth is a closed system with only energy input from the sun.B. Earth is an open system with only energy input from the sun.C. Earth is a closed system with no energy input, just recycling.D. Earth is an open system with no energy input, just recycling.

Answer 1

The correct answer is B. Earth is an open system with only energy input from the sun. Earth is a planet inserted in a specific solar system that orbits around the sun. Although there are other energy sources in the universe, the main energy source is the sun.