What would you expect to observe in the O horizon of a soil profile?

Question

Quizplus · Accepted Answer

The O horizon is the topmost layer of soil and is composed of organic material such as decaying plant matter. Therefore, plants growing in a dark soil would be expected in the O horizon. The presence of rocks or bedrock would be more likely in deeper soil layers, while mineral matter that was dissolved would not accumulate in the O horizon but instead would be washed downward into lower layers.

What Would You Expect to Observe in the O Horizon