How to Make a Seashell - Just Add Water

The video explains how sea creatures like cocolithophores and snails build shells using calcium carbonate. Near the ocean surface, water is saturated with calcium and carbonate, making shell formation easy. However, at greater depths, shells dissolve more readily due to lower saturation. This creates a feedback loop where dissolved shells add calcium carbonate back to the water. Atmospheric CO2 affects ocean chemistry by reducing carbonate availability, complicating shell building. If CO2 levels rise too quickly, the ocean's balancing act may fail, leading to widespread shell dissolution and impacting marine life.

How do sea-dwelling creatures like cocolithophores form their shells?

• By absorbing minerals from the ocean floor

• By using sunlight to harden their shells

• By secreting a special protein

• By extracting calcium and carbonate from the water

What happens to calcium carbonate shells at greater ocean depths?

• They turn into coral

• They float to the surface

• They become stronger

• They dissolve more easily

What is the role of dissolved shells in the ocean's mineral balance?

• They have no effect on the ocean's chemistry

• They decrease the ocean's salinity

• They contribute to the mineral balance by adding calcium carbonate

• They increase the ocean's temperature

How does increased atmospheric CO2 affect ocean chemistry?

• It makes the ocean more alkaline

• It increases the amount of carbonate in the ocean

• It decreases the amount of carbonate available for shell building

• It has no effect on ocean chemistry

What could happen if CO2 levels rise faster than the ocean can compensate?

• The ocean will become more saline

• All shells might dissolve, affecting marine life

• The ocean's temperature will drop significantly

• The ocean will become more acidic