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📘 How a coral reef builds limestone

See how coral polyps, symbiotic algae, calcium carbonate, recruitment, and erosion build a reef.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Polyp
Symbiosis
Calcium carbonate
Colony growth
Reef zones
Accumulation
Chemistry
Erosion
Recruitment
A living limestone city

Questions this course answers

What builds a stony coral skeleton?

Coral polyps precipitate a hard calcium-carbonate skeleton.

What do symbiotic algae provide?

Algae share photosynthetic products with their coral hosts.

What determines net reef growth?

Growth must exceed physical and biological loss.

Why do coral shapes differ?

Colony architecture reflects local environmental tradeoffs.

Why is recruitment important?

Recovery depends on successful juvenile establishment.

Grounded in trusted sources

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