The ozone layer is a layer in the Earth’s stratosphere composed of ozone (O3), a molecule formed by three atoms of oxygen. It is located in the higher levels of the atmosphere.

Sewage in localities is typically treated in sewage treatment plants where it undergoes various processes like sedimentation, aeration, and filtration to remove contaminants before being released into water bodies or used for irrigation.

It’s important to monitor and regulate pesticide use to minimize environmental contamination, prevent excessive accumulation in the food chain, and protect both ecosystem health and human health.

The percentage of biodegradable waste in households or classrooms can vary, but it often includes kitchen waste, paper, and organic materials, which usually constitute a significant portion of the total waste.

To calculate the amount of waste generated, collect and weigh the waste from home or classroom for a day. Separate it into biodegradable and non-biodegradable categories to understand the composition.