What can cover a till plain?

A till plain is characterized by its formation through the deposition of sediment by glacial activity. Covering a till plain can occur with a variety of sediment types, which include eolian (wind-blown), glaciolacustrine (sediments deposited in glacial lake environments), and outwash sediments (materials deposited by meltwater flowing from glacial areas). All three of these sediment types may accumulate over the surface of a till plain, contributing to its overall geology and influencing soil formation processes.

Eolian sediments can be transported over significant distances by wind, glaciolacustrine sediments accumulate as glaciers melt and retreat, and outwash sediments are laid down by the powerful rushing water that occurs during and after glacial melting. Collectively, these processes can lead to diverse soil profiles and ecological zones within or overlying a till plain, thereby demonstrating the versatility of such environments in landscape development.

The other options represent materials or features that are less commonly associated with covering a till plain. Organic matter and topsoil generally form in situ over time rather than serve as a covering layer. Granite and volcanic rocks would typically indicate geological formations distinct from glacial processes and are not likely to cover a till plain. A layer of moraine deposits, while related