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The UK's Main Rock Types

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The UK's Main Rock Types

The 3 main types of rock found in the UK are igneous, sedimentary and metamorphic rocks.

Sedimentary

Sedimentary

  • Sedimentary rocks are formed when layers of sediment are compacted together over time. There are 3 main types in the UK:
    • Carboniferous limestone is a fairly hard rock formed from shells and skeletons of dead marine organisms.
    • Chalk is formed like carboniferous limestone but is softer.
    • Clay is a very soft rock made from mud and clay minerals.
      • Chalk and clay are mainly found in the south-east of England with carboniferous limestone to the north and west.
Igneous

Igneous

  • Igneous rocks (e.g. granite) are formed when magma from the Earth's mantle cools and hardens.
  • A typical property of igneous rocks is that they are hard.
  • Igneous rocks are found scattered across Scotland, Northern Ireland, north-west Wales and south-west and north England.
Metamorphic

Metamorphic

  • Metamorphic rocks are formed when heat and pressure cause other rocks to change. The resulting rocks are harder and more compact.
    • Shale becomes slate when exposed to heat and pressure.
    • Slate becomes schist when exposed to more heat and pressure.
  • Metamorphic rocks are found in large bands across Scotland, Northern Ireland and Wales.
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