Continental rifting like what is occurring in eastern Africa is characterized by

Question

Continental rifting like what is occurring in eastern Africa is characterized by:

A. rift valleys and volcanoes

B. mid-ocean ridges and Benioff zones

C. subduction and Benioff zones

D. subduction and mid-ocean ridges

E. none of the above

On what basis do geologists organize silicate minerals into groups?

A. hardness and cleavage

B. the geometry of the silica tetrahedra bonds

C. the number of different metals in the chemical structure

D. streak color

E. the presence of hydrocarbons

According to the definition used in geology, a mineral must:

A. have defined cleavage and hardness

B. have a crystalline structure

C. be a heterogeneous solid

D. be organically formed

E. All of the above

The most common rock-forming minerals on Earth belong to which mineral class?

A. carbonates

B. sulfates

C. oxides

D. native elements

E. silicates

Salt is not a mineral because it is an evaporite.

A. True

B. False

Which of the following is not a way that minerals form?

A. solidification from a melt

B. precipitation from a solution

C. solid-state diffusion

D. biomineralization

E. All of the above are ways that minerals form

Explanation / Answer

1) A. rift valleys and volcanoes

eastern Africa rift is characterized by rift localization and magmatism along the entire rift zone

2) B. the geometry of the silica tetrahedra bonds

3) E. All of the above

According to the definition used in geology, a mineral is defined as a substance must meet five requirement naturally occuring, inorganic, solid, definite chemical composition, ordered internal structure

4) E. silicates

The most common rock-forming minerals belong to the silicate group, which means that they are based on silicon and oxygen for their basic elemental components

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