Foundations of Earth Science

Chapter 1: Minerals: Building Blocks of Rocks

True or False

1. Ions form when atoms gain or lose neutrons.  
2. Isotopes of the same element have different mass numbers.  
3. The elements silicon and carbon comprise nearly three-fourths of Earth's continental crust.  
4. Quartz is the mineral from which plaster and other similar building materials are composed.  
5. Luster is the external expression of a mineral's internal orderly arrangement of atoms.  
6. Uncombined atoms have the same number of neutrons as protons.  
7. The structure of the silicon–oxygen tetrahedron consists of four oxygen atoms surrounding a smaller silicon atom.  
8. Vitreous, pearly, and silky are types of metallic lusters.  
9. Reserves are already-identified mineral deposits from which minerals can be extracted profitably.  
10. A mineral is a naturally occurring inorganic solid that possesses an orderly crystalline structure and a definite chemical composition.  
11. Oxides, sulfides, and carbonates are common nonsilicate mineral groups.  
12. Some naturally occurring solids lack a repetitive atomic structure and are referred to as amorphous.  

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