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