What fitted with filters are used in factories to let out smoke and gases?

Spilling of oil or petroleum and dumping of chemical wastes from factories into rivers and seas pollute:

What are recycled to make playground surfaces, pencil pouches and diary covers?

To which colour is the white marble of the Taj Mahal in Agra turning?

The waste from animals is called:

What are used to make jewellery items like beads, rings and bracelets?

What does the smoke from vehicles, factories and houses pollute?

The burning of fossil fuels and the destruction of rainforest are the main reasons for the increase in the amount of:

Which of the following grow well in the warm and moist air of a greenhouse?

What is done to reduce the accumulation waste like metals, paper clothes, rubber and plastic in land fills?