Question

1. which of the following best defines a mineral

a. any solid found on earth
b. a naturally occurring, inorganic solid with a crystal structure
c. a rock formed from lava
d. a mixture of sediments

1. which rock type forms from magma or lava

a. sedimentary
b. metamorphic
c. igneous
d. clastic

1. which mineral property describes how shiny a surface appears

a. streak
b. density
c. luster
d. hardness

dok 2

1. which statement correctly compares rocks and minerals

a. minerals are made of rocks
b. rocks contain one or more minerals
c. rocks and minerals are the same
d. minerals form only through erosion

1. a rock forms when sediment is compacted and cemented. what type of r

a. igneous
b. metamorphic
c. sedimentary
d. extrusive

Explanation:

Question 1

To define a mineral, we recall geological definitions. A mineral is a naturally occurring, inorganic solid with a crystalline structure. Option A is too vague, C is a rock (mineral - rich but not a mineral), D is a rock (mixture of minerals). So B fits.

Igneous rocks form from the cooling and solidification of magma or lava. Sedimentary forms from sediment accumulation, metamorphic from existing rocks under heat/pressure, and clastic is a sedimentary sub - type. So C is correct.

Luster is the property that describes how shiny a mineral's surface appears. Streak is the color of the powder, density is mass/volume, hardness is resistance to scratching. So C is correct.

Answer:

B. A naturally occurring inorganic solid with a crystal structure

Question 2