A microwave is turned on for 150 seconds and it uses 9000 J of energy. The total power needed is 125 W. Calculate the efficiency of
the microwave oven

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.

The rocks expand when there hot/warm  and contract when they are cold.