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.