Which feature is used to classify a rock based on its composition?

a the origin of the rock
b the texture of the rock
c the types of minerals in the rock
d the shapes of the crystals in the rock

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen