Coral Undersea · The ocean08 / 12

Coral, currents and the deep sea: 8 facts for kids

Coral is a living animal that bleaches when the water is too warm; the deep sea is dark and cold. Coral Undersea lies beneath the waves. Coral polyps are animals that live with tiny algae, and water that is too warm makes them bleach. The deeper you go, the darker and colder it gets, and life around deep-sea vents runs on chemical energy. Your child clears away lost fishing nets and helps the reef recover.

01

Corals are animals

Coral polyps are animals; many reef-building corals live with tiny symbiotic algae.

Is coral an animal or a plant? Read more →

02

Coral bleaching

Stress such as excessive warmth can expel symbiotic algae. Bleached coral is not always dead, but recovery is not guaranteed.

Why does coral turn white? Read more →

03

Ocean currents

Currents are influenced by winds, density differences and Earth’s rotation; local eddies and slow areas also occur.

What makes ocean water move in currents? Read more →

04

Light at depth

Sunlight weakens with depth; water absorbs wavelengths differently.

Why does the sea get darker the deeper you go? Read more →

05

Hydrothermal vents

Seawater heated in the crust can emerge at vents; some deep-sea ecosystems rely on chemical energy.

What are hydrothermal vents in the deep sea? Read more →

06

Seagrass and carbon

Seagrasses are marine flowering plants that provide habitat and help store carbon.

Is seagrass the same as seaweed? Read more →

07

Lost nets and wildlife

Lost fishing gear can still entangle turtles, fish and other animals; proper recovery reduces harm.

Why are lost fishing nets dangerous to sea animals? Read more →

08

Whale migration

Some whales migrate long distances between feeding and breeding areas; routes vary by species.

Why do whales travel such long distances? Read more →