Which factor is crucial for the growth of corals?

Corals thrive in environments where there is clear water without silt because this clarity is essential for photosynthesis, a critical process for coral survival. Corals have a symbiotic relationship with algae known as zooxanthellae, which live within their tissues. These algae require sunlight to photosynthesize and produce energy, which the corals then utilize for growth and nourishment.

Clear water enhances light penetration, allowing photosynthesis to occur more effectively. In contrast, high pollution levels, low water clarity, and cold temperatures can detrimentally impact coral health. Pollution can reduce water quality and harm the delicate ecosystems, while cloudy water decreases light availability for the symbiotic algae. Cold water temperatures are generally unsuitable for most coral species, as they prefer warmer tropical and subtropical conditions. Hence, the presence of clear water without silt is integral to the optimal growth and health of corals.