1. Food scraps – These begin to decompose and break down due to bacteria and fungi, turning into organic matter and sometimes producing odors and gases.2. Paper – Over time, paper gets damp, weakens, and can tear or crumble as fibers break down, especially if exposed to moisture.3. Plastic packaging – Plastics do not biodegrade quickly; they may become brittle, crack, or break into smaller pieces (microplastics) through physical wear and sunlight exposure.4. Aluminum cans – These can corrode or rust if exposed to moisture, but generally remain intact for a long time. They can be recycled to recover the metal.5. Glass bottles – Glass is very durable and usually remains unchanged unless it breaks into shards through impact.