Salty seas and oceans cover what percentage of the Earth's surface?

نمکین سمندر اور سمندر زمین کی سطح کے کتنے فیصد حصے پر محیط ہیں؟

30 per cent

50 per cent

70 per cent

90 per cent

Explanation

Oceans cover about 70 percent of the Earth's surface and about 97 percent of all water on and in the Earth is saline—there's a lot of salty water on our planet.