Difficult Round

How many men have walked on the moon?

• 12
• 13

• 14

• 15

What to do you the science that deals with the study of spiders and scorprions?

• Archeology

• Arachnology

• Technology

• Biology

What colorless, pungent gas is often dissolved in water to yield a solution that is used as a biological preservative?

• Kerosene

• Vinegar

• Formaldehyde

• Carbohydrate

Used primarily in fertilizers, which element is never found free in nature even though it makes up about 2.5% of the earth's crust?

• Calcium

• Oxygen

• SIlicon

• Potassium

What element, whose symbol derived from the Latin for "liquid silver", has been found in Egyptian tombs from 1500 B.C.?

• Mercury

• Gold

• SIlver

• Aluminum