Explanation

Tertiary treatment involves filtering, chlorination, and removing salts to further purify wastewater.

It is the final and most advanced stage of wastewater treatment.

Explanation

Cyclones are usually accompanied by high rainfall.

heavy showers mean: A period of heavy rain

Cyclones mean  ایک قسم کی طوفان

heavy showers  زیادہ بارش/  بھاری بارش

Explanation

• The ozone layer in the stratosphere absorbs and restricts ultraviolet (UV) radiation from the sun.
• It protecting life on Earth from harmful UV rays.

Explanation

Carbon dioxide (CO₂) is a major greenhouse gas that helps trap heat in the Earth’s atmosphere.

It plays a key role in maintaining Earth’s temperature but excess CO₂ leads to global warming.

Explanation

Air contains water vapour, smoke, dust particles, and ozone in varying amounts.

These components are naturally present in the atmosphere, contributing to various environmental and weather phenomena.

Explanation

Explanation

Sea caves are formed when sea waves erode the base of a cliff, creating deep depressions in the rock.

These caves are typically shaped by the continuous action of water eroding the rock over time.

Explanation

The greenhouse effect occurs when gases like CO₂ and methane trap heat from the sun in the Earth's atmosphere.

This trapped heat keeps the planet warm enough to support life but contributes to global warming when intensified.

Explanation

Smog is formed by mixing air with pollutants and exhaust gases resulting from human activities

Main Causes of Smog:

1. Using Coal as a Fuel ·

2. Vehicular and Industrial Emissions ·

3. Overpopulation & Excessive Consumption ·

4. Excessive Waste Production 

Explanation

CFCs (Chlorofluorocarbons) are not produced by vehicles.

They are primarily released from refrigerants and industrial processes.

CO2, NO2, and CO are all pollutants emitted by vehicle exhaust.