Aeration • Affect • Agricultural • Air • Allow • Causing • Channels • Contribute • Created • Crop • Density • Excessive • Exchange • Flow • Found • Gases • Geological • Growth • Have • Health • Impact • Infiltration • Influence • Inhibit • Large • Limiting • Microscopic • Nutrient • Often • Openings • Plants • Play • Processes • Production • Range • Reducing • Refer • Result • Root • Roots • Serve • Significance • Soil • Solid • Space • Than • Tiny • Transport • Used • Within