3. what statement best describes an independent variable?
a. the factor that does not change, but impacts the constant in an experiment
b. the factor that's changed by the experimenter and impacts the constant in an experiment
c. the factor that's not changed by the experimenter and is impacted by the dependent variable
d. the factor that's changed by the experimenter and impacts the dependent variable

The independent variable is changed by the experimenter to get an effect from the dependent variable. Therefore, the best answer is D.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.