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The Rock Cycle Ch 4 S 1
Introduction • Rock: solid mixture of 1+ minerals and organic mater that occurs naturally • Rocks are always changing • Rock Cycle: process in which a new rock forms from older rock material
The Value of Rock • Used as • Tools • Weapons • Building Material
Weathering, Erosion, & Deposition • Weathering: Process in which wind, water, ice, and heat break down rock • How sediment is formed • Erosion: Process in which sediment is removed from its source • Deposition: Process in which the sediment moved by erosion comes to a rest • It is in this process that sedimentary rock may be formed
Heat & Pressure • Sediment + Pressure = Sedimentary Rock • Sediment + High Temperature & Pressure = Metamorphic Rock • Rock can become hot enough to form magma • Magma Cools = Igneous Rock
How the Cycle Continues • Uplift: movement that causes rock inside the Earth to be moved to the surface • When rock reaches the surface weathering, erosion, and deposition start
Round & Round It Goes • Each rock type can change into any of the three types of rock • Variables such as time, pressure, temperature, weathering, erosion, and location determine what type of rock is formed.
Rock Classification • Scientists divide rock into 3 classes: igneous, sedimentary, or metamorphic • Scientists can classify rocks further by their texture and composition
Composition • Composition: the chemical makeup of a rock (minerals or other material) • Composition depends on what minerals the rock contains
Texture • Texture: quality of the rock based on size, shape, and position of mineral grains • Fine grained • Medium grained • Coarse grained