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

Explanation:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.