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 stratosphere is heated mainly by ozone.
• Ozone layer absorbs harmful ultraviolet (UV) radiation from the Sun.
• This absorption converts solar energy into heat.
• It causes warming in the stratosphere instead of cooling.
• This layer protects Earth from dangerous UV rays.

Last verified on 01-05-2026

Explanation

• Climate change is mainly affected by energy use and environmental policies.
• Non-renewable energy (coal, oil, gas) increases carbon emissions, so it does not positively contribute.
• Afforestation helps reduce CO₂ and improves climate.
• Emission Trading System encourages reduction of emissions.
• Therefore, non-renewable energy is harmful for climate balance.

Last verified on 01-05-2026

Explanation

Composition of Air:

• Nitrogen → 78%
• Oxygen → 20.95%
• Argon → 0.93%
• Carbon dioxide → 0.04%
• Other gases → very small traces

Last verified on 30-04-2026

Explanation

• Radio signals are reflected by the ionosphere
• It lies roughly 60 km to 1000 km above Earth.
• It reflects radio waves back to Earth
• It is very important for AM radio

Last updated by NA on 28April 2026