EARTH SCIENCE Prentice Hall EARTH SCIENCE Tarbuck Lutgens 

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Presentation transcript:

EARTH SCIENCE Prentice Hall EARTH SCIENCE Tarbuck Lutgens 

Rocks 3.1 The Rock Cycle  Rocks are any solid mass of mineral or mineral-like matter occurring naturally as part of our planet.  Types of Rocks 1. Igneous rock is formed by the crystallization of molten magma.

Rocks 3.1 The Rock Cycle  Types of Rocks 2. Sedimentary rock is formed from the weathered products of preexisting rocks that have been transported, deposited, compacted, and cemented. 3. Metamorphic rock is formed by the alteration of pre-existing rock deep within Earth (but still in the solid state) by heat, pressure, and/or chemically active fluids.

The Rock Cycle 3.1 The Rock Cycle  Shows the interrelationships among the three rock types (igneous, sedimentary, and metamorphic)  Magma is molten material that forms deep beneath the Earth’s surface.  Lava is magma that reaches the surface.  Weathering is a process in which rocks are broken down by water, air, and living things.  Sediment is weathered pieces of Earth elements.

The Rock Cycle

Energy That Drives the Rock Cycle 3.1 The Rock Cycle  Processes driven by heat from the Earth’s interior are responsible for forming both igneous rock and metamorphic rock.  External processes produce sedimentary rocks.  Weathering and the movement of weathered materials are external processes powered by energy from the sun.

Formation of Sedimentary Rocks 3.3 Sedimentary Rocks Erosion involves the weathering and the removal of rock. Deposition occurs when an agent of erosion—water, wind, ice, or gravity—loses energy and drops sediments.  Weathering, Erosion, and Deposition

Formation of Sedimentary Rocks 3.3 Sedimentary Rocks Compaction is a process that squeezes, or compacts, sediments. Cementation takes place when dissolved minerals are deposited in the tiny spaces among the sediments.  Compaction and Cementation

Features of Some Sedimentary Rocks 3.3 Sedimentary Rocks  Features of sedimentary rocks are clues to how and where the rocks are formed

Formation of Metamorphic Rocks 3.4 Metamorphic Rocks  Metamorphism means “to change form.”  Conditions for formation are found a few kilometers below the Earth’s surface and extend into the upper mantle.  Most metamorphic changes occur at elevated temperatures and pressures.

Agents of Metamorphism 3.4 Metamorphic Rocks  Heat  Pressure Provides the energy needed to drive chemical reactions Causes a more compact rock with greater density