themassmaker

summary sheet year 8 gcse ncert light sound vibrations artic ice the global warming debate global warming notes exams revision aqa unit 11 economics synthetic plastic fibres thyroid penis reproduction in animals vagina endocrine adolescence air pollution water microbes non metals metals incandescent light bulb solar system stars sun electromagnets magnets friction refraction cooling heating food minerals digestion habitat environment ecological compounds mixtures elements 8f atoms solvent solute amplitude density forces kilograms effects pressure buoyancy weight mass newtons archimedes chemistry debate scientists calcium carbonate water droplets sodastraw stalacite limestone cave limestone caves limestone cave report stalagmites report making periscope periscope cpu central processing unit humayun sher shah history india