R R_H123 New member Mar 25, 2010 #1 ...been in existence? 1)How do sedimentary and metamorphic rocks indicate how long the rock cycle has been in existence? 2)What is the basis for identifying rocks as igneous or sedimentary? a-chemical reactivity b-method of origin c-hardness
...been in existence? 1)How do sedimentary and metamorphic rocks indicate how long the rock cycle has been in existence? 2)What is the basis for identifying rocks as igneous or sedimentary? a-chemical reactivity b-method of origin c-hardness
