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REVIEW FOR TEST • Granite is formed when magma cools slowly deep underground. Major Rock Group: Igneous Sub Rock Group: Intrusive • Basalt forms on the surface after erupting from a volcano. Major Rock Group: Igneous Sub Rock Group: Extrusive • Gneiss forms when granite underground undergoes extreme heat and pressure squeezing the minerals into parallel bands. Major Rock Group: Metamorphic Sub Rock Group: Foliated • Limestone formed from skeletons and shells of organisms that lived in the ocean. Major Rock Group: Sedimentary Sub Rock Group: Organic Observation or Inference? • All middle school students are bringing lunch from home. • Observation Observation or Inference? • All middle school students are bringing lunch from home because lunch is not good. • Inference Observation or Inference? • You observe the sky at noon is darkening. • Observation Observation or Inference? • You observe the sky at noon is darkening, because it is about to rain. • Inference What type of igneous rocks form from volcanic eruptions onto earth’s surface? Extrusive Igneous Rock What type of igneous rocks form underneath the Earth’s surface by the cooling of magma? Intrusive Igneous Rock • At a mineral and fossil show, Elizabeth bought two quartz crystals that cost $3.00 each and four trilobite fossils that cost $5.00 each. Come up with an equation to show the total cost of her purchase. • (2 x 3.00) + (4 x 5.00) = purchase cost • What is the repeating pattern of atoms, ions, or molecules in a mineral called? • Crystal •What process forms sediment? •Weathering and Erosion • Which mineral is the most resistant to scratching? • Diamond