Answer:
Option (C)
Explanation:
Coquina is usually defined as a sedimentary limestone rock that is found to be present in the freshwater zones and in the coastal areas. This rock is made up of broken shells that are smaller in size. The rocks can be easily broken down by the constant flowing of sea waves.
This rock is commonly formed in the same way as the other sedimentary rocks, i.e. it is formed by the deposition of sediments carrying these organic remains and eventually undergoes the process of compaction and lithification on the seafloor.
Thus, the correct answer is option (C).
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. Old, dense crust tends to be subduction back into the earth.
Answer:
B) Distinctly alkaline diagnostic horizons, thin profiles, lack of organic material, and dominance of sandy materials are features most closely associated with aridisols.
Explanation:
The aridisols are types of soils that are found predominantly in arid areas. They are soils that are not considered as fertile, and are near the bottom by quality of soils. These soils are lacking organic material, and also are very exposed to erosion, with the primary reason being the climate, as it doesn't allow for lot of vegetation to grow. The horizons of the aridisols are distinctly alkaline diagnostic ones, with the profiles being very thin and labile. The top layer of the soil is dominated by sandy material, which is a result of the extensive weathering and erosion in their surroundings, so the wind is mostly transporting small sandy grains and covers most of the area with them.
