rocks

• igneous: granite and basalt
• metamorphic: marble and quartzite
• sedimentary: sandstone and limestone
• how were igneous rocks formed?

  formed as a result of volcanic activity, it cools down and solidifies
• intrusive rocks were formed from material that cooled inside the crust
• extrusive rocks were formed from material that cooled on the surface
• granite is an intrusive rock and basalt is extrusive
• how were sedimentary rocks formed?

  formed from the remains of rocks, plant life and animal life that have been compressed and cemented together
• how is limestone formed?

  in a bed of shallow, warm seas from skeletons of tiny creatures that piled up over millions of years
• limestone is permeable
• how was sandstone formed?

  formed when large amounts of sand were worn away from earths surface and transported by wind and rivers
• how are metamorphic rocks formed?

  formed when igneous or sedimentary rocks came into contact with great heat and pressure
• how was marble formed?

  when molten magma forced it way into a body of limestone
• how was quartzite formed?


  when sandstone came into contact with magma deep in earths crust
• positive effects of mining rock/quarrying: - creates jobs - provides raw materials for construction
• negative effects of mining rock/quarrying: pollution of water, soil, air, and land