Chapter 13 Landform _Friday Mar 28_

Chapter 13 Landform _Friday Mar 28_ - Title Page Photo...

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1 Title Page Photo Composition Study of Landforms Critical concepts Scale and Pattern
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2 The Composition of Earth (REVIEW) • Minerals – Common characteristics • Solid • Found in nature • Inorganic • Specific chemical composition • Atoms arranged in a regular pattern to form solid crystals
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3 • Rocks – Composed of mineral matter (usually more than one kind of mineral) – Outcrop • Bedrock exposure – Bedrock • Buried layer, never eroded – Regolith • Layer of soil and rock
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4 – Three types of rocks • Igneous • Sedimentary • Metamorphic - Fig. 13-6
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5 1. Igneous Rocks – Formed by solidification of magma – Magma – molten material in Earth’s interior (lava when it hits the surface) – Pyroclastics – rocks formed by the welding together of volcanic rock – Classified by mineral composition and texture – Fig. 13-6a 3 Types of Rocks
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6 1. Igneous Rocks Plutonic (Intrusive) Rocks Solidified beneath Earth’s surface Large mineral structure (coarse-grained) – Fig. 13-6a Light-colored, generally Granite – most common
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7 Fig. 13-8a. Sylvan Lake, Black Hills, SD Granite Exposed by erosion above or pushed up from forces below
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8 – Volcanic (Extrusive) Rocks • Small mineral structure (fine-grained) • Dark-colored, generally • Basalt most common – Fig. 13-17
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9 Fig. 13-19. Snake River Canyon, Idaho. Basalt
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10 2. Sedimentary Rocks Formed of sediment consolidated by pressure and cementation – Rock fragments and organic matter transported by water and wind – Sedimentation sorts materials by size – Deposited into distinct layers (strata)
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Chapter 13 Landform _Friday Mar 28_ - Title Page Photo...

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