The Arctic Ocean is the smallest and shallowest of Earth's five oceans, sitting at the very top of the planet around the North Pole. Most of this ocean stays frozen for much of the year, covered by thick sea ice that floats on the surface like a massive frozen cap.

Imagine Earth as a ball spinning on an axis, with the Arctic Ocean surrounding the northern endpoint of that axis. Countries like Russia, Canada, Norway, and the United States (through Alaska) all have coastlines touching this frigid ocean. The water temperature hovers around freezing year-round, and during winter, when the sun barely rises, the ice cover expands dramatically.

Despite the harsh conditions, the Arctic Ocean supports remarkable life. Polar bears hunt seals on the ice, while whales navigate through gaps in the frozen surface. Indigenous peoples have lived along its shores for thousands of years, developing sophisticated ways to survive and thrive in one of Earth's most challenging environments.

Scientists pay close attention to the Arctic Ocean because it's warming faster than other parts of the planet. The summer ice cover has been shrinking, which affects everything from polar bear hunting grounds to global weather patterns. This ocean might seem remote, but what happens there ripples outward, influencing climate and ocean currents across the entire world.