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15
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What mainly causes erosion of sediments?
Heat from magma
Water wind and ice
Earth’s core movement
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15
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How does sediment size affect deposition?
Smaller sediments always settle first
Larger sediments settle first
All sediments settle together
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15
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Why are fossils rarely found in igneous rocks?
No layers form
Heat destroys remains
Pressure is too low
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15
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How does water help cementation?
It breaks minerals apart
It increases temperature
It carries dissolved minerals
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15
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Why are older sediment layers usually found at the bottom?
They are heavier
They formed by heat
They were deposited first
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15
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Why do sediments form layers?
Layers form only underground
Different sediments settle at different times
All sediments fall at once
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15
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Which sedimentary rock forms from compacted clay?
Basalt
Granite
Shale
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15
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Which environment is MOST suitable for thick sedimentary rock layers?
Volcanic vents
River deltas and seabeds
Mountain cores
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eraser
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seesaw
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shark
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thief
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15
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What evidence shows a rock formed from sediments?
Glassy texture
Interlocking crystals
Visible layers and grains
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boom
Lose 50 points!
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star
Double points!
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gift
Win 25 points!
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baam
Lose 5 points!
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trap
No points!
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gift
Win 20 points!
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rocket
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banana
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15
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Which sequence correctly shows how sedimentary rocks are formed?
Melting-cooling-solidification
Heat-pressure-recrystallization
Weathering-erosion-deposition-compaction-cementation
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15
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Which factor does NOT affect sedimentary rock formation?
Water movement
Gravity
Magnetic force
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What is the main source of sediments?
Earth’s core
The Sun
Pre-existing rocks
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15
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Which process changes solid rock into sediments without moving them?
Deposition
Erosion
Weathering
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