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The Changing Earth-CScope Unit 4 Vocabulary: Types of Soil Clay- a type of soil with very fine particles, that is pliable when wet and hard when dry Gravel-a type of soil made of large-sized particles and pebbles Hummus-a rich, dark layer of soil made of decaying plants and animals Loam-a type of soil containing a mixture of other soils and rich in humus and nutrients Mineral-a nonliving solid object with a crystal structure found in nature Nutrient-a substance needed by an organism to grow and survive Particle-a small piece or part of a substance Sand-tiny pieces of broken rocks Sediment- small particles of rock, roil, sand, or shell deposited by water, wind, or ice Silt-a type of soil made of fine-grained sediment Soil-the layer of Earth’s surface consisting of small pieces of rock, decayed plant and animal matter, and minerals Topsoil-the top layer of soil, often the richest in nutrients for plant growth Water- a clear liquid that falls from the sky and fills oceans, rivers, and lakes