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How many rock quarries are in the world?

There is no exact number of rock quarries in the world as they are constantly changing due to opening, closing, and merging of operations. However, it is estimated that there are tens of thousands of rock quarries globally.


The absolute age of a rock is the approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determined by?

It is best determined by radiometric dating techniques which measure the decay of radioactive elements.


Is lava a sedimentary rock or igneous?

The common usage of "lava rock" in the USA refers to a black rock with a number of visible bubbles or air pockets that is formed from cooled lava on the surface. Although lava rock is an igneous rock, it is not the same as the definition for the word igneous, which can also include igneous rocks which have solidified from magma below the surface.


What is the coordination number of each type of ions in a rock salt type crystal structure?

Six. Explanation: Rock salt (NaCl) is ionic crystalline compound having Na+ and Cl- ions. Each Na+ is surrounded by 6 Cl- ions and vice versa. Coordination number for an ion is the number of oppositely charged ions around it. So it is 6.


How many rocks are in the earths crust?

There are three primary rock types in the earth's crust. Most of the crust consists of igneous rock. Metamorphic rock is either igneous or sedimentary rock that has changed form through heating and compression. The most common type of exposed rock is sedimentary, which forms from the conglomeration of sea, lake or river sediments, or from the bodies of tiny creatures, such as corals and limestone.As for the total number of different types, there are hundreds. As for the total number of individual rocks, this changes as rock is cemented together or breaks apart, and I'm not going to bother estimating it here.