1. What is more plentiful on Earth—the group of minerals known as feldspars or the group of minerals known as silicates? 2. A tectonic plate is subducted. Why will its rocks and minerals change? 46....

1. What is more plentiful on Earth—the group of minerals known as feldspars or the group of minerals known as silicates?

2. A tectonic plate is subducted. Why will its rocks and minerals change?

46. Why do some high-quality drills have diamond tips?