clastic sedimentary rocks Flashcards
1
Q
Sedimentary rocks Start as ……
…… from ……
A
Start as sediments. Deposited from erosion
2
Q
What is the PROCESS of sedimentation
A
- Deposition ( sediments laid horizontally )
- Burial and compaction ( compressee by weight )
- Groundwater ( seeps in with disaolved chemicals )
- Cementation ( grains cement)
3
Q
What are sedimentary rocks deposited in / what may happen
A
Deposited in beds / strata. Rocks may fold and deform
4
Q
Asymmetrical ripples
A
Water + wind on top
5
Q
Symmetrical ripples
A
Back + forward water flow (waves)
6
Q
Cross bedding
A
Larger particles settle first.
