These features classify limestone as a sedimentary rock. Granite is a very hard rock made from large crystals. It does not react with acids. These features help to classify granite as an igneous rock.

A layer of limestone covers most of the surface of modern Egypt ... The oldest ground of modern Egypt comprises outcrops of metamorphic and igneous rocks. The Nile River cuts its way north from Sudan; ...

In arid climates like the desert southwest limestone is resistant to weathering and forms cliffs just as sandstones do. Layered igneous rocks (flows and sills) are generally more resistant than ...

Igneous rock is formed by the cooling of molten rock ... For example, marble is created when limestone is pressure-cooked within the earth, causing the minerals that compose the stone to re-form into ...

What FACTS ABOUT ROCKS do you know? They are abundant on earth, and yet little is known about them. These facts will increase your knowledge of the rocks.

and phanerites with preponderant leucite have been produced in association with a large xenolith of metamorphosed limestone. Similar reactions on a larger scale may have contributed to the production ...

Basic rocks are those rich in calcium such as limestone (including chalk), some calcareous schists and some igneous (volcanic) rocks, such as serpentine and basalt. Their distribution is limited in ...