A diagram is a drawing that describes the relationship of all the parts of a system. Earth materials are the solid, liquid, and gaseous materials that make up the earth and its atmosphere. Pebbles are rocks that are 6-64 mm. Gravel is a collection of rocks that are 1-6 mm. Sand is made up of rock particles that are .062-1mm. 5.
Silt is a particle of rock much smaller than sand.
It's the rock size that mud is made of. Clay is made of pieces of rock even smaller than silt.