A lipid is a diverse group of organic molecules that are insoluble in water but soluble in nonpolar solvents. They serve various functions in living organisms, including energy storage, insulation, and forming the structure of cell membranes. Lipids are essential for life and are found in various foods, such as oils, butter, nuts, and avocados.
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).