Question

Rocks are classified as igneous, metamorphic, or sedimentary according to?

Answer 1

their method of formation, or ORIGIN

Step-by-step explanation:

Rocks can be classified as sedimentary, igneous, or metamorphic based primarily upon differences in their ORIGIN.

Answer 2

Their characteristics

Step-by-step explanation:

The chemical composition of the rock, mineral type, texture, etc...