classify the materials based on their composition rock, clear liquids, peppercoms, concrete, salt, oxygen, birdseed, plant

1. rocks are composed of grains of minerals which are formed by the longest natural chemical reaction

2. clear liquids are mainly sugar and water. they are transparent food and mainly are beverages, ice, grains etc stuff

3. concrete is made up of basically three components. water, aggregate (rock, sand and gravel) and portland cement.

4. salt consist of NaCl it is made up of sodium and chloride it is also called rock or halite salt