Question: Choose your answer.

Ice water is poured into four cups made of different materials. The cup made of which material will be the coldest to touch after one minute?
My Answer: metal

Question: Choose your answer.

Which property of a mineral can be determined just by looking at it?
My Answer: luster

Question: Choose your answer.

What occurs if the body's renal system fails to work?
My Answer: Metabolic waste builds up in the blood.

Question: Choose your answer.

A perpetual motion machine is a theoretical device which, once started, continues to operate without any additional input of energy. Which statement describes why a perpetual motion machine is impossible to design?
My Answer:
Friction reduces the efficiency in a system.