Create slides with pictures and examples on forces for Grade 7..pptx science-subject-for-middle-school-friction-force.pptx The-Spark-of-Life-Stanley-Miller-and-the-Origin-of-Life.pptx Classic-Experiments-on-the-Evolution-of-Life.pptx Natural-Hazards-Mitigation-and-Adaptation.pptx LIGHTS-REFRACTIONS-AND-REFLECTIONSS.pptx 
