Radon Forms by the Radioactive Decay of __________

Q13: A mineral that is valued for its

Q14: Which of the following best describes an

Q15: Minerals whose chemical elements include carbon and

Q16: Halite (table salt) is composed of _.<br>A)

Q17: Ninety-two percent of the Earth's crust is

Q19: Which one of the following is not

Q20: Feldspar is a _ mineral.<br>A) silicate<br>B) clay<br>C)

Q21: Which of the following is not an

Q22: Quartz makes up _ percent of the

Q23: Ninety-two percent of the Earth's crust is