There are various types of rocks and some rocks are broken down into pieces which leads to become sand. Moreover, sedimentary rocks are formed by the layers of deposition that takes place. The main difference between a sedimentary rock and sediment is that in case of sedimentary rocks the sediments are stuck together to form a hard rock like structure and sediments are normally loose in nature.
1. Fracking 2. Air pollutants. 3. Decomposition of organic matter e.g. in landfills. 4. <span>Chlorofluorocarbons </span>mainly in refrigerants and air conditioners.
The answer is the second one. Deforestation of rain and forests and other parts of the world volcanic eruptions and widespread forest fires. This activity has contributed greatest amount of carbon dioxide into the atmosphere over the past 100 years.
