For rocks:
1. Origin: This refers to how the rock was formed:
* Igneous: Formed from cooled and solidified magma or lava.
* Sedimentary: Formed from the accumulation and cementation of sediments.
* Metamorphic: Formed from the transformation of existing rocks due to heat, pressure, or chemical reactions.
2. Mineral Composition: This refers to the specific minerals that make up the rock. Some common minerals found in rocks include quartz, feldspar, mica, and calcite.
For soil:
1. Texture: This refers to the relative proportions of sand, silt, and clay particles in the soil. These proportions determine the soil's ability to hold water and nutrients, as well as how easily it can be worked.
2. Horizon: This refers to the different layers of soil that develop over time. Each horizon has distinct characteristics in terms of color, texture, and composition. For example, the A horizon is usually the topsoil and is rich in organic matter, while the B horizon is the subsoil and contains more clay and minerals.
