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15
×
Lithification includes which two processes?
Weathering and erosion
Melting and cooling
Compaction and cementation
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baam
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rocket
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rocket
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baam
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15
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Which sequence correctly shows how sedimentary rocks are formed?
Heat-pressure-recrystallization
Melting-cooling-solidification
Weathering-erosion-deposition-compaction-cementation
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15
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What would happen if compaction did not occur?
Rock would melt
Sediments would remain loose
Fossils would burn
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baam
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seesaw
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shark
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thief
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15
×
Why are older sediment layers usually found at the bottom?
They were deposited first
They formed by heat
They are heavier
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15
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Which sedimentary rock forms from compacted clay?
Shale
Basalt
Granite
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Why does cementation usually occur after compaction?
Water carries minerals into spaces between sediments
Heat fuses sediments
Pressure melts sediments
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15
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What mainly causes erosion of sediments?
Earth’s core movement
Water wind and ice
Heat from magma
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eraser
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gold
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gift
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banana
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15
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Why are fossils rarely found in igneous rocks?
Heat destroys remains
Pressure is too low
No layers form
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15
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How does sediment size affect deposition?
All sediments settle together
Larger sediments settle first
Smaller sediments always settle first
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15
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Which environment is MOST suitable for thick sedimentary rock layers?
Mountain cores
Volcanic vents
River deltas and seabeds
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15
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What happens to pore spaces during compaction?
They become smaller
They fill with air only
They increase in size
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15
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What is the main source of sediments?
The Sun
Earth’s core
Pre-existing rocks
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15
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Which process changes solid rock into sediments without moving them?
Weathering
Erosion
Deposition
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