ArcaMax

Knowledge

on Apr 5, 2025

Chalcedony
Chrysoberyl
Chrysoprase
Corundum

Corundum. Ruby and sapphire are both forms of corundum, with a hardness rating just below a diamond.

Science Trivia / May 17, 2025

Moon. The moon is about 1/80th the size of the Earth in mass.

Science Trivia / May 17, 2025

Keratin. A rhinoceros's horn is made of keratin.

Science Trivia / May 16, 2025

0.00%. Scientists believe the Earth is 4.56 billion years old.

Science Trivia / May 16, 2025

Nimbus. Clouds are classified according to their height and appearance.

Science Trivia / May 15, 2025

Precipitation. Drizzle, rain, snow and sleet are several of the different forms of precipitation.

Science Trivia / May 15, 2025

Great Barrier Reef. Australia's Great Barrier Reef can be seen from outer space.