Greases are semisolid lubricants composed of a thickening agent dispersed in a liquidlubricant. They are used to reduce friction and wear between moving parts, as well as to provide a barrier against moisture and debris in various mechanical systems.
Plan and carry out investigations that demonstrate the chemical and physical processes that form rocks and cycle Earth’s materials (e.g., processes of crystallization, heating and cooling, weathering, deformation, and sedimentation).