1. In silicate minerals, tetrahedra may be coordinated to form ____________.
a. long one-dimensional chains
b. extensive two-dimensional sheets
c. massive three-dimensional frameworks
d. All of the above are correct.
2. Two types of bonds that depend upon polarity are ____________ and ____________.
a. hydrogen bonds; van der Waals bonds
b. ionic bonds; covalent bonds
c. hydrogen bonds; metallic bonds
d. ionic bonds; van der Waals bonds