Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens) II. Classification Igneous rocks are classified according to their composition and texture. 4 basic types of textures Glassy – black and sharp Fine grained – interlocking pieces Coarse grained – consist of interlocking mineral crystals Porphyritic – made of large crystals scattered on the back of small crystals. Igneous Rocks Coarse-Grained Granite Gabbro Fine-Grained Rhyolite Basalt III. Magma vs. Lava Magma – molten material below the earth’s surface. Lava – molten material above the earth’s surface. A. Intrusive Igneous Rocks: Magma pushes into surrounding rock below the Earth’s surface Cools slower Large Crystals Think: (INSIDE) Examples: Did you know?!?! Granite is the most abundant intrusive rock! B. Extrusive Rocks: forms when magma erupts onto the Earth’s surface (lava), cools quickly very small or no crystals formed Think: (EXTERIOR) Example: Basalt is the most common EXTRUSIVE igneous rock! Did you know?!?! Another name for an Extrusive rock is a VOLCANIC rock A Closer Look at an Igneous Rock Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive? http://www.youtube.com/watch?v=P qgHUPSTojY Must write down TWO things you learned!!!! Be prepared to share! A little Science Rap http://www.youtube.com/watch?v=rkGVE6 wNAzo