13. Soil begins to form when lichens and weather break down volcanic rock into smaller pieces during
A. pioneer species
B. primary succession
C. secondary succession
D. climax communities

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

a compound light microscope is used to magnify objects in steps.  

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answer; synapse;