Explanation

• The hardest substance in the world is diamond.
• Its hardness is due to the strong covalent bonding between its carbon atoms.
• This making it the most resistant to scratching.

Additional information:

• Category: Native minerals
• Cleavage: 111 (perfect in four directions)
• Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
• Crystal habit: Octahedral
• Crystal system: Cubic
• Dana classification: 1.3.6.1
• Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Last verified on 07-06-2026

Explanation

• Author: J. K. Rowling
• Full Name: Joanne Rowling
• Born: 1965
• Birth Place: United Kingdom
• Profession: Author, Screenwriter
• Harry Potter series has 7 main books.
• First book: Harry Potter and the Philosopher’s Stone (1997).

Last verified on 04-04-2026

Explanation

• Vitamin A is essential for vision, skin health, and immune function.
• Its deficiency can lead to night blindness (poor ight vision) and other health problems.

Additional information:

• Dry skin and eyes
• Impaired immune function
• Poor wound healing
• Increased risk of respiratory and urinary tract infections

Last verified on 17-01-2026

Explanation

• The Nile is the longest river in the world
• Length of about 6,650 km

 Additional information

Last updated by NA on 27 April 2026

Explanation

J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays.

The proton was discovered by Ernest Rutherford.

The neutron was discovered by James Chadwick.

Explanation

• Mercury is mostly made up of iron.
• It's surface covered with craters.
• It has no atmosphere and no moons.
• It's closest to the sun.
• It's smallest planet.

Explanation

• Au comes from the Latin word aurum, meaning "gold" (from "glowing dawn")
• Atomic number: 79
• Belongs to group 11 
• Category: transition metal

Additional information:

• Atomic mass: 196.97 u
• Melting point: 1,064°C
• Boiling point: 2,856°C
• Density: 19.3 g/cm³ (very heavy)

Explanation

Plasma is the fourth state of matter, following:

1. Solids
2. Liquids
3. Gases

It consists of ionized gases with equal numbers of positively and negatively charged particles.

Explanation

The National Assembly has a total of 342 seats.

Of these, 266 are filled through direct elections.

10 seats are reserved for religious minorities.

60 seats are reserved for women, allocated through proportional representation to parties with more than 5% of the vote.

Explanation