PADI Divemaster Certification Practice Exam

What percentage of the Earth's surface is covered by water?

1. 60%

2. 71%

3. 85%

4. 97%

The correct answer is: 71%

The correct answer is based on well-established scientific data that indicates approximately 71% of the Earth's surface is covered by water. This includes oceans, seas, lakes, and rivers. The vast majority of this water, about 97%, is saline and found in the oceans, while the remaining 3% is freshwater found in ice caps, glaciers, and underground sources. Understanding the distribution of water on Earth is critical for divers and marine professionals, as it helps provide context for underwater environments, marine ecosystems, and conservation efforts. Recognizing that a significant portion of the planet is covered by water is also vital for planning dives, understanding buoyancy, and engaging in safe diving practices.