The term DEPOSIT COAL is used to describe a type of sedimentary rock that is formed from the remains of plants and animals that have been compressed and heated over time. The crossword solutions for this term are SILT (4 letters), LODE (4 letters), and LOESS (5 letters). SILT is a type of sedimentary material that is composed of very small particles, usually clay or SILT-sized particles. LODE is an ore deposit that is found in a vein or layer within a rock formation. LOESS is a type of sedimentary material that is composed of wind-blown SILT and clay particles.