Memory Mixtures and Soil MemoryVersion en ligne Match the vocabulary word to the definition. par Michael Porter weathering soil mixture the remains of decayed plants or animals in the soil To be slowly broken down by the natural processes that destroy a plant or body sand topsoil The smallest particles of rock that make up soil a combination of two or more different substances that keep their identities decay A mixture of water, air, tiny pieces of rock, and humus silt The largest particles of rock that make up soil A characteristic of matter that you can observe or measure directly The upper layer of soil in which plants have most of their roots Particles of rock that are smaller than sand but larger than clay clay humus The breaking down of rocks on Earth’s surface into smaller pieces physical property