What's sand and humus look or feel like?

Sand consists of small, granular particles that are gritty and can range in color from white to brown or red, depending on its mineral content. It feels coarse and dry to the touch. Humus, on the other hand, is dark, rich organic matter found in soil, often appearing crumbly or spongy. It has a smooth, earthy texture and a strong, pleasant smell, indicating its nutrient-rich composition.