Over 99% of Earth's Habitable Space Resides in the Ocean

The vast volume of Earth's oceans, from the surface to the deepest trenches, provides an immense three-dimensional habitat. This incredible aquatic realm supports the majority of the planet's biodiversity, making it the largest living space.

Source

https://education.nationalgeographic.org/resource/ocean-habitat/

Details

Published: March 29, 2026
views: 84

Earth Ocean Biology Ecology Habitat Biodiversity Marine Life Deep Sea Ecosystems

Related Facts

Weird49 views

You Cannot Hum While Holding Your Nose

Try it right now: pinch your nose and attempt to hum. It's physically impossible. Humming requires the mouth to be closed, so sound resonates through the nasal cavity and exits through the nostrils. Block the nostrils and there is nowhere for the airflow to go, preventing the vocal cords from vibrating.

Weird47 views

Human Stomach Acid Is Strong Enough to Dissolve Zinc

Gastric acid (hydrochloric acid) has a pH of around 1.5 to 3.5 — corrosive enough to dissolve metallic zinc. The stomach doesn't digest itself because it is continuously coated by a thick mucus layer. Stomach lining cells are replaced entirely every 3–5 days to prevent acid damage.

Weird39 views

The Human Nose Can Distinguish Over 1 Trillion Different Scents

A 2014 study published in Science (Bushdid et al., Rockefeller University) revealed that humans can discriminate at least 1 trillion distinct odors — far exceeding the long-held estimate of 10,000. The olfactory system uses around 400 different receptor types that combine to create millions of scent signatures.

Humanbody109 views

The Stomach Produces Enough Acid to Dissolve Metal — and Renews Its Lining Every 3–4 Days

Gastric acid in the stomach reaches a pH of 1.5 to 3.5 — acidic enough to dissolve zinc and corrode certain metals. Yet the stomach doesn't digest itself because mucus-secreting cells continuously coat the stomach wall with a protective bicarbonate-rich mucus layer. This protection is temporary: the stomach completely replaces its inner lining every 3–4 days. If this renewal failed, gastric ulcers would quickly develop, as occurs in H. pylori infections that disrupt the mucus barrier.