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Rocks
JC: How rocks are formed and used
| Term | Definition |
|---|---|
| Igneous Rocks | Formed as a result of volcanic activity. Hot molten magma cools on or within the crust. e.g. basalt, granite |
| Sedimentary Rocks | Formed from the remains of other rocks, plant life and animal life.e.g limestone, sandstone. |
| Metamorphic Rocks | Igneous or sedimentary rocks that were changed by great heat and pressure e.g marble and quartzite. |
| Granite | Formed when molten magma forced its way into the earths crust. It cooled slowly creating large crystals.Pink, black or grey in colour. Found in Wicklow. |
| Basalt | Formed when lava cooled on the earths surface. Cools quickly creating small crystals. Grey or black in colour.Found in the Giants Causeway. |
| Limestone | Formed on sea bed from the compressed remains of dead fish and sea creatures. Grey in colour. Found in the Burren |
| Sandstone | Formed from layers of sand compressed together and cemented. Brown to red in colour. Found in the Magillycuddy reeks. |
| Permeable | Permeable rocks allow water to pass through them. |
| Marble | Formed when molten magma pushes its way into limestone. It is white, red, green or black. Green marble is found in Connemara |
| Quartzite | Sandstone came in contact with magma during folding. It is grey or white.Found on Croagh Patrick |
| Natural Resource | Something that occurs in nature that is a value to people.e.g water |
| Drilling | A method of extracting oil from deep in the ground. |
| Open cast mining | Cheap method of removing resources from the ground near to the surface.It is not environmentally friendly. |
| Shaft mining | A method of extracting resources deep in the ground e.g coal |
| Corrib gas field | Gas field found off the coast of Mayo. |