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Rocks Junior Cert
Revision of Rock for Junior Cert Students
Term | Definition |
---|---|
Mineral | A hard substance that forms naturally under the ground |
Igneous | Rocks that are formed by the cooling of molten magma or lava |
Crystals | Minerals that are mostly clear (transparent in colour and have a particular shape |
Sedimentary | Rocks that are formed when sediments and the remains of plant and animal life are deposited and compacted |
Fossil | Remains of sea creatures (shells and skeletons) that are preserved in the rock |
Deposition | The process where sediments are laid down (dropped) by water (rivers or sea) |
Metamorphic | Rocks that are formed when existing rocks are changed by heat and pressure |
Permeable | when water is able to seep or pass through rocks |
Strata | The layers in which the deposits that form some sedimentary rocks are laid down |
Natural Resource | Something that occurs in nature and is of use to people |
Marble | Metamorphic rock formed from limestone |
Quartzite | Metamorphic rock formed from sandstone |
Basalt | Rock formed when lava cooled quickly on the surface |
Granite | Rock formed when lava cooled slowly beneath the surface |
Slate | Rock that is used on roofs and snooker tables |
Three | The number of groups rocks can be divided into |
The Burren | Well known Limestone Region in Ireland |
The Giants Causeway | 40,000 hexagonal blocks of basalt in Co.Antrim |