Burying waste materials in a pit or a container covered with soil is a method to observe the decomposition process. This helps in understanding how different materials break down over time and the rate at which they do so.

Pesticides are chemicals used to protect crops from diseases and pests. They help in crop preservation and yield enhancement.

Ozone in the atmosphere is formed when higher energy UV radiation splits molecular oxygen (O₂) into free oxygen (O) atoms, which then combine with molecular oxygen to form ozone (O₃).

Organic materials such as kitchen waste (vegetable peels, used tea leaves), and natural fabrics (like cotton clothes) are likely to decompose the fastest due to their biodegradable nature and the action of microbes.

Materials like plastic items (milk packets, medicine bottles/strips), synthetic fabrics, and other non-biodegradable items are likely to remain unchanged over long periods when buried.