Chapter 25, Problem 6RAT

In a sedimentary rock, the degree of particle roundness can indicate

(a) the duration and/or length of travel.

(b) where the sediment particles originated.

(c) where the particles were deposited.

(d) how the particles were cemented and compacted.

To determine

The correct option for the statement “In a sedimentary rock, the degree of particle roundness can indicate”

Answer to Problem 6RAT

The correct option for the statement “In a sedimentary rock, the degree of particle roundness can indicate” is option (a).

Explanation of Solution

Sedimentary rocks are formed in the process over four stages, weathering, erosion, deposition, and sedimentation. The decomposition of rock at or near Earth’s surface is the weathering process. The two types of weathering are mechanical and chemical weathering. In the mechanical weathering, agents physically break the rock into smaller pieces. While as in chemical weathering, the chemical reactions result in the disintegration of the rock.

When these sediments are transported from one place to another by air, water, or ice. The transportation of sediments mainly takes place by running water. When the rock is weathered, the particles are generally angular and sharp. But during transportation, these are rounded off and the sharpness reduces. Hence, the degree of particle roundness depends on the duration and length of travel.

Conclusion:

Therefore, the correct option for the statement “In a sedimentary rock, the degree of particle roundness can indicate” is option (a).