What causes ocean dead zones? a) Fertilizer run-off b) Sewage run-off c) Animal waste from farms d) All of the above
What is the world’s saltiest ocean? a) Atlantic b) Pacific c) Indian d) Artic
What is the world’s shallowest ocean? a) Artic b) Atlantic c) Indian d) Southern
What percentage of the world’s oceans are overfished? a) 50% b) 65% c) 75% d) 80%
How much of the earth is covered in water? a) 68% b) 71% c) 75% d) 79%
Click here to get the answers from Planet Green (Discovery Channel).