What are two features that geologists use to classify rocks

Geologists classify rocks into three major groups: igneous rock, sedimentary rock, and metamorphic rock. What characteristics are used to classify igneous rocks? Igneous rocks are classified according to their origin, texture, and mineral composition.

Explanation:

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

the answer is c.the valence of the atoms combine .