Texture
-Hardness
-Luster or shine
-Color/streak
1. Fracking
2. Air pollutants.
3. Decomposition of organic matter e.g. in landfills.
4. <span>Chlorofluorocarbons </span>mainly in refrigerants and air conditioners.
Mountains are cooler than valleys cause of height, then oceans cool nearby land when it's warmer