the rock cycle no …. yes…
DESCRIPTION
Rocks Defined • Solid mixture of crystals of one or more mineralsTRANSCRIPT
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The Rock CycleNo ….
Yes…..
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Rocks Defined
• Solid mixture of crystals of one or more minerals
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SO…. What are “minerals” and “crystals”?
• Minerals = anything with a definite chemical compound and definite structure and always inorganic (never was “living”) which are typically found in the earth (ex quartz, calcite, feldspar….)
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Rock Cycle Processes
Erosion• Deposition
• Compaction and Cementation• Metamorphism
• Melting• Cooling
• Solidification• Weathering
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SO…. Rocks are loose combinations of crystals of any variety of minerals
Do we have samples?
• Crystals…. a solid object/piece of inorganic substance having a definite internal structure and characterized by identifiable geometric patterns
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Rock Classification• How they are formed
• Where they are formed• Composition
– Minerals that make up a rock• Texture
– Sizes, shapes, and positions of the grains
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Value of Rock ‐ History
• Important to scientists– Help answer questions about the history of earth
and the solar system.• Record of what the Earth used to be
• Fossils
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Value of Rock• Natural resource
– Used as tools and weapons (hammers, spears,knives)
– Used in buildings, roads, and monuments
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Rock Cycle Processes
• Weathering– Rocks attacked by weather
• Air, moisture, and livingthings
– Rocks broken down intosediments• Erosion
– Sediment is transported bywind, water, ice or gravity
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Rock Cycle Processes• Deposition
– Sediments settle to the bottom• Compaction and Cementation
– Compaction• Layers form on top of each other
• Air and water pushed out– Cementation
• Loose sediments are gluedtogether by natural glue
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Melting– Rocks deep in Earth melt and become magma
• Cooling– Magma cools• Solidification
– Rock solidifies
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Rock Cycle Processes
• Metamorphism– Means changed form– Increased heat and
pressure– Changes a rock into a
metamorphic rock
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Who can tell us what is happening at each star?