QuizRiddles
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0 of 6 answered

1Which gas do plants primarily absorb during photosynthesis?

2What is the hardest naturally occurring substance on Earth?

3What is the chemical symbol for gold?

4Which organ in the human body produces insulin?

5What is the most abundant gas in Earth's atmosphere?

6At sea level, water boils at approximately what temperature?

Answer all 6 to see your result, or let the timer finish for you.

Did you know?

The facts behind the questions

A few of these questions hide a common mix-up, which is exactly what makes them interesting rather than just a memory test.

Why diamond is the hardness benchmark

Diamond's hardness comes from how tightly its carbon atoms are bonded in a rigid, repeating lattice structure — it's still the top reference point on the Mohs hardness scale.

Nitrogen, not oxygen, dominates our air

Despite oxygen getting all the attention for breathing, nitrogen actually makes up the majority of the air around us — oxygen is a distant second.

Gold's symbol comes from Latin, not English

Many chemical symbols trace back to Latin or Greek names rather than the modern English word for the element, which is why gold is "Au" and not "Go."