Seashells tend to appear quietly. After the tide pulls back, they are just there, mixed into the sand, sometimes whole, sometimes worn thin. They do n.
Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges ...
Seashells are abundant along coastlines, originating from mollusks that construct exoskeletons for protection. Comprised mainly of calcium carbonate, these shells possess enduring qualities that make ...
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