Soil is formed through the geologic cycle of weathering, transportation and deposition of rocks and minerals. There are two main types of soil: residual, which forms in place from weathered rock, and transported, which is moved by forces like wind, water or glaciers. Soil can also be classified by particle size into categories like gravel, sand, silt and clay. Different soil types have varying suitability for uses in construction, which can be assessed through simple tests of properties like texture and binding ability. Stones are another construction material obtained through quarrying, dressing, seasoning and testing to ensure good qualities like strength, durability and workability.