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

What do grass eating animals release in large amount when their food is digested?

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

Where is ozone found?

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

Earth's atmosphere is a blanket of:

Melting of polar ice caps and rise in water levels of oceans are effects of:

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

Greenhouse gases in the atmosphere trap the heat of the sun and there is a rise in temperature on the earth. This is called:

What is the spoiling of land, air and water called?