Explanation

• Carbon dioxide (CO₂) — the main greenhouse gas causing global warming.

Additional information:

• Methane (CH₄) — potent, from livestock and fossil fuels.
• Nitrous oxide (N₂O) — from fertilizers and industry.
• Water vapor — natural, amplifies warming.
• Fluorinated gases — synthetic, very strong effect.

Explanation

• Cumulonimbus clouds are tall, dense clouds associated with thunderstorms.
• They can produce hail, heavy rain, lightning, and strong winds.
• Hail forms when strong updrafts inside these storm clouds carry water droplets upward, where they freeze.

Last verified on 09-09-2026

Explanation

• Phosphorus is not among the top 10 most abundant elements in the Earth's crust.
• Most abundant element in Earth crust is Oxygen.
• Oxygen in the crust is (46. 1%).
• The chemical formula of oxygen (dioxygen) is O2.

List of 10 Most Abundant Elements in the Earth's Crust:

Last verified on 01-09-2026

Explanation

• The main reaction occurring in the Sun's core is nuclear fusion.
• In fusion, hydrogen nuclei combine to form helium, releasing a huge amount of energy.
• This energy is responsible for the Sun's light and heat.
• The Sun's primary fusion process is the proton–proton chain reaction.

Last verified on 01-09-2026

Explanation

• A series of steps is called a staircase, stairway, or a flight of stairs

Additional information:

• Tread: The flat, horizontal top surface where you place your foot.
• Riser: The vertical part that forms the gap between one step and the next.
• Nosing: The front, rounded edge of the tread that sticks out over the riser

Last updated 14 August 2026 by NA