What is another word for Sub-soil?
Pronunciation: [sˈʌbsˈɔ͡ɪl] (IPA) 
Synonyms for the word "sub-soil" can include terms such as subterranean layer, substratum, bedrock, underground soil, and subterranean earth. These words are used to describe the layer of soil that lies beneath the topsoil and is usually composed of clay, gravel, and minerals. They are often used interchangeably, depending on the context in which they are used. Sub-soil is an important part of the earth's crust and plays a vital role in agriculture, as it contains the nutrients that plants need to grow. Its composition can vary greatly depending on the region and can have important groundwater implications.
