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.

Explanation

Mangroves grow in salty coastal areas and have roots that stabilize the shoreline, reducing erosion.

They also serve as nurseries for marine life, providing shelter and breeding grounds for fish and other organisms.

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

The mesosphere is the coldest layer of the atmosphere, with temperatures dropping as low as -90°C.

It lies above the stratosphere and below the thermosphere.

Explanation

Priestly discover oxygen in 1776.

Oxygen makes up about 46-50% of the Earth's crust by weight, mainly in the form of oxides and silicates.

It is also a major component of water (H₂O).

It is abundant in the atmosphere as O₂.

Explanation

Nuclear energy is produced by splitting atoms (fission) and relies on uranium, a finite resource, making it non-renewable.

Renewable sources like solar, geothermal, and biomass naturally replenish over time.

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

Uranium is a non-renewable energy source used in nuclear power plants for generating electricity through nuclear fission.

It is finite and cannot be replenished on a human timescale, unlike renewable energy sources such as solar or biomass.

Explanation

Water is used for various recreational activities like swimming, rafting, and boating.

These activities promote physical health.

These are popular in tourism and leisure industries.

Explanation

The Earth's atmosphere is divided into five main layers: Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere.

Each layer has unique characteristics such as temperature, density, and composition.