Colluvium: Deposition at Cliff Bases
The question asks to identify the term for unconsolidated rock material deposited by surface wash specifically at the base of a cliff.
Defining Colluvium
- Colluvium refers to loose, unconsolidated sediments that accumulate at the base of slopes or cliffs.
- This deposition occurs primarily due to gravity (mass wasting) and surface runoff or wash, which transport material downslope.
- The description directly matches the definition of colluvium.
Analyzing Other Options
- Alluvium: This is sediment deposited by flowing water, typically in river channels, floodplains, or deltas. It's not specific to cliff bases or deposition by simple surface wash from a cliff face.
- Moraines: These are deposits formed directly by glacial ice, characterized by specific landforms and till composition, unrelated to surface wash at a cliff base.
- Silt: This describes a particle size (sediment grade) between sand and clay. While silt can be a component of colluvium, it is not the term for the deposit itself.
Therefore, colluvium is the correct term for the described deposit.
Important Questions from Geomorphology
Which one of the following is not an igneous rock?
Which of the following statements is/are correct?
1. Hypocenter is the point on the surface of the Earth, nearest to the focus.
2. Velocity of earthquake waves is higher in denser materials.
3. P waves move faster and are the first to arrive at the surface of the Earth.
Select the correct answer using the code given below:
Which one of the following is the lowermost/innermost intrusive igneous rock?
The formation of ‘tors’ on small rocky hills is associated with which among the following?
Which one of the following statements about metamorphic rocks is not correct?
