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Which sequence correctly shows how sedimentary rocks are formed?
Melting-cooling-solidification
Weathering-erosion-deposition-compaction-cementation
Heat-pressure-recrystallization
Which process changes solid rock into sediments without moving them?
Deposition
Erosion
Weathering
What mainly causes erosion of sediments?
Heat from magma
Earth’s core movement
Water wind and ice
During deposition
They turn into crystals
what happens to sediments?
They settle when energy decreases
They melt into liquid
Why do sediments form layers?
Layers form only underground
Different sediments settle at different times
All sediments fall at once
What increases the rate of compaction?
Less pressure
Lower temperature
More layers piling on top
Which mineral commonly causes cementation?
Plastic or rubber
Calcite or silica
Iron metal
Why does cementation usually occur after compaction?
Pressure melts sediments
Water carries minerals into spaces between sediments
Heat fuses sediments
Which environment is MOST suitable for thick sedimentary rock layers?
Mountain cores
Volcanic vents
River deltas and seabeds
What type of sediment forms conglomerate rock?
Melted magma
Large rounded pebbles
Fine volcanic ash
How does sediment size affect deposition?
Smaller sediments always settle first
All sediments settle together
Larger sediments settle first
What evidence shows a rock formed from sediments?
Interlocking crystals
Glassy texture
Visible layers and grains
Why are fossils rarely found in igneous rocks?
Heat destroys remains
Pressure is too low
No layers form
Lithification includes which two processes?
Compaction and cementation
Melting and cooling
Weathering and erosion
How does water help cementation?
It carries dissolved minerals
It breaks minerals apart
It increases temperature
Which sedimentary rock forms from compacted clay?
Shale
Granite
Basalt
