The lime

One of the most common minerals of the outer part of the earth's crust is the carbon dioxide lime, which forms mountains of limestone and marbles, in a large number is included in the composition of soils and marls. Lime is dissolved in river waters and sea water. It is built at home, mixed with other substances in cement, lining the sidewalks of cities. Perhaps, only with clay could argue the lime in her help to man.

The history of lime is far from being fully understood

The history of lime is far from being fully understood. Many scientists are engaged in its solution. The fact is that every year rivers bring to the seas and oceans, in the form of tiny particles or turbidity, enormous amounts of lime; every 15 thousand years the rivers bring it as much as it now has in all the seas and oceans. Where then does the lime of the seas disappear?

It turns out that it is eaten and laid by animals that inhabit the seas, turning them into their skeletons and shells. For example, corals build giant structures, raising them by an average of one centimeter per year. For hundreds of thousands of years, thus, grow huge reefs and islands.

Other, even smaller animals - kornenozhki, also use lime to build their vital skeleton. On huge areas of the bottom of the oceans they accumulate powerful layers of white fine-grained sediments: chalk or limestone.

After lime in the form of skeletons, shells and shells of marine animals slowly falls to the bottom of the seas and oceans, at the bottom a muddy mass of these formless particles is formed, mixed with the remains of life and the products of decay of dead organisms. By chemical and physical processes, which are called diagenesis, this mass forms rock, which layer by layer grows on the bottom of the seas and oceans.

After that, lime in the form of calcareous rock slowly rises to the surface. At the same time, the waters flow away and the powerful mountain ranges grow on the place of the seas and oceans; Underwater layers of limestones form the tops of mountain ridges.

But then rains, frost, keys and streams begin their work. Dissolving carbonated lime, they bring to life amazing phenomena on a huge scale: corroded limestone fields with huge funnels and deep-seated tubes. Slowly, a drop by drop, the lime dissolves in these depths, and the fabulous beauty of caves are decorated with a motley pattern and luxurious architecture...

This is how the migration of lime occurs. The water dissolves the lime in one place to be deposited in the other. Powerful stalactite columns in caves are replaced by carbonate crusts around plants in lakes, thin cavernous tubes are replaced by a gentle, soft calcareous tuff, enveloping plants and algae in sources on the surface. Part of the dissolved lime goes back to the rivers and re-enters the seas and oceans with water, the other passes through a complex transformation history, in order, too, to merge into the waters of the oceans. So the circle closes in the history of lime.

Tools