Term
click below
click below
Term
Normal Size Small Size show me how
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. |