The correct answer is: A. weathered parent material that is not affected by translocation and organic modification.
The horizontal of soil profile is composed of weathered parent material that is not affected by translocation and organic modification. This material is called the A horizon. It is the top layer of soil and is the most fertile. The A horizon is made up of organic matter, minerals, and water. The organic matter comes from plants and animals that have died and decomposed. The minerals come from the parent material, which is the rock that the soil was formed from. The water comes from precipitation and from the ground.
The A horizon is important because it is where plants grow. The plants take in the minerals and water from the A horizon and use them to grow. The A horizon also helps to protect the underlying soil from erosion.
The A horizon is a dynamic layer of soil. It is constantly changing as plants grow and die, as minerals are weathered, and as water moves through the soil. The A horizon is also affected by human activities, such as agriculture and development.
The A horizon is a valuable resource. It is important to protect the A horizon from erosion and contamination. We can do this by planting trees and other vegetation, by using sustainable agricultural practices, and by reducing pollution.
The other options are incorrect because they do not describe the horizontal of soil profile.
Option B: material affected by translocation & organic modification is incorrect because the A horizon is not affected by translocation and organic modification.
Option C: unweathered bedrock is incorrect because the A horizon is made up of weathered parent material.
Option D: None of the above is incorrect because one of the options is correct.