The document describes an activity where students examine and eat edible rocks made of various food ingredients to learn about the composition of real rocks made up of different minerals. Students observe the properties of their edible rock, make predictions about its ingredients, take it apart to identify the actual ingredients like raisins or nuts, and answer questions comparing real rocks' mineral variations to the food ingredient variations in the edible rocks. The activity aims to teach students that rocks are composed of combinations of minerals that make each rock unique.