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

Explanation

• The Earth’s atmosphere is divided into different layers (Troposphere, Mesosphere, and Exosphere).
• Hydrosphere refers to all water bodies on Earth.
• Therefore, Hydrosphere is not part of the atmosphere.

Additional information:

• Troposphere: 0–12 km (weather layer)
• Stratosphere: 12–50 km
• Mesosphere: 50–85 km
• Thermosphere: 85–600 km
• Exosphere: 600 km and above

Last verified on 21-04-2026

Explanation

• Rainfall is measured using a Rain Gauge.
• It collects rainwater and measures it in millimeters (mm).
• Widely used in weather forecasting and meteorology.
• Helps in studying climate and agriculture patterns.

Last verified on 31-03-2026

Explanation

In a cloudburst, rainfall specifically exceeds 100 millimetres (about 4 inches) per hour over a localized area. 

Explanation

• Limiting factors are environmental conditions that restrict the growth, abundance, or distribution of organisms.
• They determine which species can survive and how many individuals of each species can exist in an ecosystem.
• Limiting factors can be abiotic (non-living) like sunlight, water, or temperature.
• They can also be biotic (living) like competition, predation, or disease.

Last verified on 15-03-2026

Explanation

• Tundra is a cold, treeless region found near the Arctic and Antarctic.
• Soil is often frozen (permafrost) throughout the year.
• Vegetation includes mosses, lichens, and low shrubs.
• Animals adapted: polar bears, arctic foxes, reindeer.

Last verified on 13-03-2026

Explanation

• The ozone layer is a part of the Earth’s stratosphere that absorbs most of the Sun’s harmful ultraviolet (UV) radiation.
• Without it, UV rays could cause skin cancer, cataracts, and environmental damage.
• It is found approximately 15–35 km above Earth’s surface.

Last verified on 13-03-2026

Explanation

• Chlorofluorocarbons (CFCs) are chemical compounds used in refrigerators, air conditioners, and aerosol sprays.
• When released into the atmosphere, CFCs destroy the ozone layer by breaking down O₃ molecules.
• The ozone layer protects Earth from harmful ultraviolet (UV) radiation.

Last verified on 10-03-2026