How are seashells created? Or any other shell, such as a snail's or a turtle's?

Seashells Art Figurine of Five Stacked Turtles 3.75 Tall

Phylum Mollusca – The Professional Site of Jason Charbonneau

Why are there no seashells in Hawaii? - Quora

Beachcombing in the Bahamas

How Seashells Are Made Reactions Science Videos - American

PPT - The Effects of Acids on Seashell Corrosion PowerPoint

How Seashells Are Made Reactions Science Videos - American

This seashell I picked up had a Conch still in it. : r

STEM-Works - The Shallows Articles - How are seashells created? Or

Full article: Clarifying 'carbon sequestration

How are seashells made? - Woods Hole Oceanographic Institution