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.

Many different types of rocks can be found in Great Parks, from local fossil-rich limestone to igneous and sedimentary rocks brought here from the north by glaciers during the last Ice Age. Once a ...

marble that you might see in kitchen counters or statues came from limestone that was transformed under intense heat and ...

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 ...

Mysterious micro-burrows in desert marble and limestone were probably made by microbes that lived millions of years ago. Exactly what kind of microbes bored into the rock remains unknown ...