I. How to Identify Rocks? Scientist study rock by looking at two types of criteria: composition and texture. 1. Composition The chemical makeup of a rock.

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Presentation transcript:

I. How to Identify Rocks? Scientist study rock by looking at two types of criteria: composition and texture. 1. Composition The chemical makeup of a rock.

I. How to Identify Rocks? Scientist study rock by looking at two types of criteria: composition and texture. 2. Texture: Is based on the size shape and position of mineral grain/crystals.

II. 3 Ways Magma Forms

III. Texture Igneous pattern Metamorphic pattern Sedimentary pattern

A. Texture of Igneous Rock Intrusive Igneous Rock Rock formed from the cooling and solidification of magma beneath the Earth’s surface. Slow cooling results in the formation of large crystals. (Coarse-grained Texture) Interactive Rock Sim

A. Texture of Igneous Rock 2. Extrusive Igneous Rock Rock that forms as a result of volcanic activity at or near the Earth’s surface Fast cooling results in the formation of small crystals. (Fine-grained Texture) - Interactive Rock Sim

Four Igneous Rocks Web Activity

B. Composition of Igneous Rock 1. Felsic Rock Light colored rocks. Composed of aluminum, potassium, silicon, and sodium. 2. Mafic Rock Dark colored rocks. Composed of calcium, iron, and magnesium. Fine-grained Course-grained Course-grained Fine-grained