Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called coral reefs.
Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called what?

Eukaryotic cell division involves mitosis and cytokinesis.
Eukaryotic cell division involves mitosis and what?

Varves type of stratified deposit is formed where lakes are covered by ice in the winter.

What type of stratified deposit is formed where lakes are covered by ice in the winter?