Materials of the Earth

Cards (11)

  • Igneous rocks are formed by the cooling and hardening of magma
  • magma is a molten material that is under the earth's surface
  • an igneous rock is intrusive if magma cools and solidifies beneath the earth's surface
  • an igneous rock is extrusive from lava which is magma that reached earth's surface
  • sedimentary rocks are deposited at the bottom of the rivers, lakes and oceans
  • metamorphic rocks are the hardest kind of rocks produced by hardening of igneous and sedimentary rocks
  • granite, gabbro, diabase, diorite, pegmatite, peridotite are examples of intrusive igneous rocks
  • pumice, obsidian, rhyolite, scoria and dacite are examples of extrusive igneous rocks
  • limestone, sandstone, dolomite, siltstone, gypsum, rock salt, chalk, coal are examples of sedimentary rocks
  • slate, gneiss, schist, and phyllite are examples of foliated metamorphic rocks
  • marble, quartzite, skarn, hornfels, ignite, garnet are examples of non-foliated metamorphic rocks