Can Calcium Carbonate and Silica can be dissolved and reformed as a cement by the action of natural acids?

One can tell if a sedimentary rock is soft or hard based on the existence or lack of broken calcium carbonate shells.

A fossil is any preserved evidence of a living organism. I have discovered fossilized spark plugs off the coast of Oregon, in Sunset Bay. The calcium carbonate in the water reacted with the rusting spark plug to form a cement that "glued" the rocks, sand, and metal together.

Therefore, in the correct circumstances, calcium carbonate does react to form a natural cement, and this reaction can happen very quickly.

Yes, calcium carbonate and silica can be dissolved and reformed as cement by the action of natural acids. This process is known as chemical weathering. In the presence of natural acids like carbonic acid (formed from carbon dioxide in the atmosphere dissolving in rainwater) or organic acids produced by decaying vegetation, calcium carbonate and silica minerals in rocks can dissolve. When these dissolved minerals are transported and then reprecipitated in suitable conditions, they can form cement-like materials, contributing to the process of sedimentation and lithification in the Earth's crust.