Approximately what percentage of the Earth's surface is covered by deserts?

The correct percentage of the Earth's surface that is covered by deserts is approximately 20%. This figure reflects the vast areas classified as desert environments, including both hot deserts, like the Sahara, and cold deserts, such as the Gobi. Deserts cover substantial regions across every continent, making them significant ecological zones that are characterized by low precipitation, sparse vegetation, and extreme temperature variations.

Research indicates that about one-fifth of the Earth's land surface is classified as desert. This proportion emphasizes the importance of understanding desert ecosystems in the study of geography, climate patterns, and environmental science. It can also help in discussions regarding biodiversity, climate change effects, and human habitation challenges in these arid regions.

The other percentages do not accurately represent the extent of desert coverage; while 30% and 10% might suggest either an overestimation or underestimation, 5% underplays the substantial areas deserts actually occupy on our planet. Understanding the correct figure is critical for a holistic view of the Earth's geography.