Question

Erosion, transportation and deposition are factors of _______.
(A) River
(B) Soil
(C) Both a and b
(D) None of these

Answer 1

Hint: Erosion is the action of surface processes that remove soil, rock or dissolved material from one location on the Earth's crust, such as water flow or wind, and then move it to another location. A deposition is a geological mechanism in which a landform or land mass is attached to sediments, soil, and rocks. Transportation refers to the transport of materials.

Complete answer:
Previously weathered surface material that is collected at the expense of adequate kinetic energy in the fluid is transported by wind, ice, water, and gravity, gradually building layers of soil. Deposition arises when the forces responsible for the transportation of sediments are no more able to resolve gravity and friction forces, generating motion opposition; this is referred to as the hypothesis of null points.
Natural rates of erosion are controlled by the action of geological weathering geomorphic drivers, such as rainfall. Eroded sediment or solutes may be transported just a few millimeters, or for thousands of kilometers. The rates at which such processes act control how fast a surface is eroded. Physical erosion is commonly the quickest on steeply sloping surfaces, and levels may also be prone to certain climate-controlled conditions, including water supply volumes, storm, wind speed, wave fetch, or air conditions

So, option C. Both a and b are the correct answer.

Note:
The accumulation of sediment from organically derived matter or chemical processes may also be attributed to deposition. For instance, chalk constitutes partly of marine plankton's microscopic calcium carbonate skeletons, the accumulation of which has triggered chemical processes to deposit more calcium carbonate.