Explanation

The lowest layer of Earth's atmosphere is called the troposphere.

This layer contains about 75-80% of the atmosphere's total mass and up to 99% of its water vapor. 

Explanation

• Natural gas produces less carbon dioxide, sulfur oxides, and particulate matter.
• It is considered a cleaner fossil fuel.

Additional information:

• Coal is the most pollutant.
• Coal producing high levels of smoke and harmful gases.
• Diesel emits more particulates and nitrogen oxides than petrol.

Last verified on 17-01-2026

Explanation

• 74 mph and above: Hurricane
• Below 39 mph: Tropical Depression
• 39–73 mph: Tropical Storm

Additional Information:

• Hurricanes are called Typhoons in the Western Pacific.
• They cause heavy rainfall, strong winds, and coastal flooding.

Last verified on 17-01-2026

Explanation

• Ozone (O₃) is mainly found in the Stratosphere, called the ozone layer.
  • It absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.
  • Located roughly 15–35 km above the Earth’s surface.

Last verified on 17-01-2026

Explanation

• The rate at which temperature decreases with increasing altitude is called the Lapse Rate.
• Lapse rate helps predict weather patterns, cloud formation, and stability of the atmosphere.

Additional information:

• Dry Lapse Rate: ~9.8°C/km (unsaturated air)
• Moist Lapse Rate: ~5–6°C/km (saturated air with condensation)

Last verified on 17-01-2026