Hull Geological Society
Common urban rocks -
There are three main types of rocks - Igneous, Sedimentary and Metamorphic.
Sedimentary rocks form in the sea, on the land or in lakes and are made up of rounded mineral grains. They are often layered. They may contain fossils (remains of animals and plants). Sandstone and limestone are types of sedimentary rocks.
In Metamorphic rocks the minerals of an existing rock have been altered by intense pressure and/or heat. The crystals may have been reorientated into layers and the layers may have bent and contorted. Some minerals may have grown bigger or new minerals may have grown through chemical reactions. Marble, slate and gneiss (pronounced 'nice') are metamorphic rocks.
To read more about the Rock Cycle click here
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