I belive it it O because <span>An O horizon has at least 20% </span>organic matter<span> by mass. Two main scenarios result in the formation of an O horizon: saturated, </span>anaerobic<span> conditions (wetlands) or high production of leaf litter in forested areas. Anaerobic conditions slow the </span>decomposition<span> process and allow organic material to accumulate. An O horizon can have various stages of decomposed organic matter: highly decomposed, sapric; moderately decomposed, hemic; and minimally decomposed, fibric. In a fibric O layer, plant matter is recognizable (e.g., it is possible to identify a leaf). Sapric material is broken down into much finer matter and is unrecognizable as a plant part. Hemic is in between sapric and fibric, with some barely recognizable plant material present. It is possible to have multiple O horizons stacked upon one another exhibiting different decomposition stages. Because of their organic content, these horizons are typically black or dark brown in color. The dominant processes of the O horizon are </span>additions<span> of organic matter, and </span><span>transformations </span><span>from fibric to sapric
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Explanation:
Limitation of Water Transport: -Water transport has the following limitations.
1. The depth and navigability of rivers and canals vary and thus, affect operations of different transport vessels.
2. It is a slow moving mode of transport and therefore not suitable for transport of perishable goods.
3. It is adversely affected by weather conditions.
4. Sea transport requires large investment on ship and their maintenance.
5. It has high maintenance costs for ship and takers as it requires constant repairs and painting of ships.
Answer:
d hope to helps mark brainiest
