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
IGNEOUS ROCKS – Classified according to their origin, texture, and composition Origin Where do they form? (Define each and give 1 example of each Drawing Extrusive rock Ex: Basalt—most common extrusive rock & most common rocks on Earth Forms much of Earth’s ocean floor Intrusive rock Ex: Granite—most abundant intrusive rock on Earth’s continents Forms the core of many mountain ranges Texture How do they form and what sizes of crystals form? Fine - Grained Ex: Basalt (Glassy texture, crystals too small to be seen with a microscope) Ex: Obsidian (Smooth, shiny texture like thick glass; Cooled without forming crystals) Course - Grained Ex. Granite (Crystals vary in size and color) Ex. Porphyry (Looks like gelatin with chopped fruit mixed in) Crystal Size Drawing Mineral Composition Most of Earth’s minerals contain silica, a material formed from oxygen & silicon. What happens when rocks are high in silica? Ex: Granite What happens when rocks are low in silica? Uses Ex: Basalt List at least 6 things that igneous rocks have/can be used for. 1. 2. 3. 4. 5. 6.