Coral Polyps and Reef Formation Quiz

Iron extracted from the ocean water

Calcium carbonate produced from carbon dioxide and calcium from the ocean (correct)

Sodium chloride obtained from the algae

Silica extracted from the surrounding water

They rely on other marine organisms to build the reef for them

They secrete a sticky substance to trap sediments and form the reef

They push away from the surface and fill the gaps with calcium carbonate (correct)

They release spores that form the structure of the reef

Several meters per year

Several centimeters per year (correct)

Only a few millimeters per year

Corals do not actively contribute to reef formation

<p>Ocean currents and other factors</p> Signup and view all the answers

<p>Depending on how fast the surrounding water is</p> Signup and view all the answers