Q: Answer the following question given this paragraph: Mother of pearl is also known as nacre. Nacre is the iridescent inner shell layer. It can be found in buttons, watch faces, knives, guns, and jewelry. It is also used to decorate various musical instruments. Q: What is another name for mother of pearl? A: | OPTIONS:
- pigment
- enamel
- calcium
- nacre
A: nacre

Q: Answer the following question given this paragraph: Alloys are mixtures of materials, at least one of which is a metal. Q: Mixtures of materials called alloys contain at least one of what type of material? A: | OPTIONS:
- coal
- liquid
- steel
- metal
A: metal

Q: Answer the following question given this paragraph: Most of the sounds we hear reach our ears through the air, but sounds can also travel through liquids and solids. If you swim underwateror even submerge your ears in bathwaterany sounds you hear have traveled to your ears through the water. Some solids, including glass and metals, are very good at transmitting sounds. Foam rubber and heavy fabrics, on the other hand, tend to muffle sounds. They absorb rather than pass on the sound energy. Q: Where does most of the sound we hear travel through? A: | OPTIONS:
- water
- light
- the ground
- air
A: air

Q: Answer the following question given this paragraph: Q: How many mass distinctions have radically altered the history of life? A: | OPTIONS:
- six
- one
- four
- five
A: five