An explanation of the geological processes that led to the formation of different types of rock.
- There are three types of rock: sedimentary, igneous and metamorphic.
- Sedimentary rock forms when deep layers of mineral and organic particles are compacted over millions of years, e.g. sandstone.
- Igneous rocks form when magma cools to a solid, e.g. basalt.
- Metamorphic rock is formed when rock is subject to heat and pressure, e.g. slate is produced from shale hardened as pressure and heat have rearranged the layers.
Yosemite Valley, California - Granite
Despite their variety, all rocks are simply aggregates of mineral grains.
Halong Bay, Vietnam - Limestone
The Grand Canyon, Arizona - Sandstone
The exact type of minerals, the size of the grains and how the rocks were formed all affect their appearance and their properties.
Granite has tightly interlocked ...
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