Science Earth

• cement?

  building material using limestone and other materials
• compound?

  substance made up of two or more elements chemically bonded together
• concrete

  a building material made by mixing sand, cement and gravel with water
• gabbro?

  a type of igneous rock with large crystals
• interlocking?

  when crystals fit together with no gaps between
• mineral?

  a natural occurring mineral or compound that can form distinct grains of rocks
• mixture?

  two or more substances jumbled together but not joined together
• permeable?

  lets water soak through
• porous

  porous rocks have tiny holes in them
• sinkhole?

  a large hole in the ground
• intrusive igneous rocks?

  rocks formed from cooling magma under the Earth's surface
• extrusive igneous rocks?

  rocks formed from cooling lava above the Earth's surface
• igneous rock?

  formed when magma or lava cools and solidifies
• metamorphic rock?

  formed when existing rocks are heated or compressed
• abrasion?

  when rock fragments bump into each other and wear away