Question

What causes the formation of rocks identified by the characteristic of graded beds of sediment? Select all that apply.

Small earthquakes
Oceanic plate colliding with a continental plate
Turbidity currents
Lava emerging underwater from rift valleys

Answer 1

Small Earth Quakes
Turbidity Currents
I think

Answer 2

Answer: Option (3)

Explanation: Turbidity current is the type of flow in which the water gently flows down in an underwater slope due to density contrast generated by the presence of various sediments.

The rocks formed from the sedimentation and compaction of these sediments under water are known as turbidites. They shows normal graded bedding in which the coarser particle settles at the bottom and finer particles are deposited on the top, showing a distinctive fining upward sequence.