Aim: How can I identify an Igneous Rock? Introduction to Rocks Aim: How can I identify an Igneous Rock?

Rock vs. Mineral Mineral- a pure substance found on Earth (element), that occurs in nature (non man-made), that is inorganic (non-living). Rock- made of one or more minerals mixed together with different materials, which can include dirt, other rocks, sands, fossils, etc.

Monomineralic or Polymineralic If a rock contains only one mineral it is called: Monomineralic If a rock is made up of more than one mineral it is called: Polymineralic

How do we determine the different types of Rocks? Rocks get classified according to their origin-How and where they were formed. There are three main categories.

Three Categories Igneous- formed when molten rock cools and solidifies. Sedimentary-the result of compaction and cementing of layers of sediment. Metamorphic- formed from heat and pressure.

Igneous Rocks Today we are going to focus primarily on one type of rocks, Igneous Rocks. When we talk about Igneous Rocks they always form by melting and solidification. So most Igneous rocks form at or near a volcano.

Identifying the Parts Using the following words: volcano, lava, magma fill in the spaces below. LAVA VOLCANO MAGMA

Unique Info Igneous Rocks are the ONLY rock made from a liquid. When liquid cools it solidifies and crystallization occurs.

How Igneous Rocks Form Lets see!

Intrusive If the Igneous rock forms inside the volcano we call it: The rock will have large crystals so we can determine that it took a long time to cool. Since this rock formed inside of the volcano, it formed from Magma

Extrusive If the Igneous rock forms at the surface of the volcano we call it Extrusive. It will have very small or no crystals, so now we can determine that it took a Short time to cool. Since this type of igneous rock formed at the surface, it formed from Lava