Ocean

Who / What

The ocean is the continuous expanse of salt water that covers roughly 70.8 % of Earth’s surface. It constitutes the planet’s largest body of water, containing about 97 % of all water on Earth.

Background & History

The ocean traces back to the earliest period of Earth’s history, forming as the planet cooled and water accumulated. Over geological time, the ocean has cycled through phases of expansion and contraction, shaping continents and climates. It remains a dynamic system, constantly reshaped by tectonic activity, sediment deposition, and atmospheric interactions.

Why Notable

The ocean is the primary component of Earth's hydrosphere and serves as a vast heat reservoir, moderating global temperature and weather patterns. Through its marine ecosystems, it supports a third of all known life and provides essential services such as oxygen production and nutrient cycling. Its role in the carbon and water cycles makes it central to planetary climate regulation.

In the News

Recent studies emphasize the ocean’s vulnerability to warming, acidification, and overexploitation, underscoring the urgency of international conservation efforts. Policy discussions increasingly focus on marine protected areas and sustainable fisheries to safeguard the ocean’s ecological integrity. Climatic events tied to oceanic fluctuations—such as El Niño and La Niña—highlight the ocean’s influence on global weather systems.

Key Facts

**Type:** Body of water / Natural feature

**Also known as:** Pacific Ocean, Atlantic Ocean, Indian Ocean, Antarctic/Southern Ocean, Arctic Ocean

**Founded / Born:** (not applicable; forms with Earth's early history)

**Key dates:** 70.8 % surface coverage; 97 % of global water

**Geography:** Earth (global)

**Affiliation:** (none)

Links

[Wikipedia](https://en.wikipedia.org/wiki/Ocean)

Sources

• 🔗 Wikipedia

The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as oceans (in descending order by area: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Antarctic/Southern Ocean, and the Arctic Ocean), and are themselves mostly divided into seas, gulfs and subsequent bodies of water. The ocean contains 97% of Earth's water and is the primary component of Earth's hydrosphere, acting as a huge reservoir of heat for Earth's energy budget, as well as for its carbon cycle and water cycle, forming the basis for climate and weather patterns worldwide.