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