Based on Discover God’s Creation Chapter 8-4, by Rebecca K. Fraker Types of Rock Based on Discover God’s Creation Chapter 8-4, by Rebecca K. Fraker

Organization Rocks can be organized into three groups: Igneous Sedimentary Metamorphic

Igneous rock Characteristics: Formed as magma cools Intrusive rocks cool slowly below ground and have a coarse texture. Example: granite Extrusive rocks cool above ground. Some are made up of small crystals (basalt). Others lack crystals and have a smooth texture (obsidian), Still others form as gas-filled lava cools (pumice)

Igneous Rock-uses Used in construction Used to make monuments and statues Obsidian used by Native Americans for knives and arrowheads. obsidian pumice

Sedimentary Rock Characteristics: Most common surface rock. Formed from sediments Sediments are held together by minerals that act as cement. Often shows layering. Examples include conglomerate, shale, sandstone, and coquina limestone.

Sedimentary Rock-uses Used in construction Used to make monuments and statues. Used for heating and energy. Provides important products: Coal Chalk Filters conglomerate sandstone Coquina limestone

Metamorphic Rock Characteristics: Formed from other rocks that are changed by heat and pressure. Banding or marbleized appearance. Examples: Marble Schist Slate

Metamorphic Rock-uses Used in construction Used to make monuments and statues marble Slate schist