1. Plate tectonics form igneous, metamorphic, and sedimentary rocks. When they diverge, the lava after a volcanic eruption results in igneous rocks. Inside the volcano, metamorphic rocks form under the pressure of the plates. When they converge, sedimentary rocks are formed, resulting in layers.
2. Physical weathering is the wind's breaking down rocks. Chemical weathering is reaction of oxygen in water with the metals in the rock. These form soil because the rocks are broken down and down until they are small particles of soil.
3. The largest sized particle is sand, and its soil permeability is high and water retention is low, since water goes through sand easily and cannot be held my sand well. The smallest is clay, and its soil permeability is low and water retention is high, since clay absorbs and holds water well. Silt's soil permeability and water retention is in between those of sand and clay.
