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