Science · Form 1 / Heat Multiple choiceExerciseForm 1 Why does a hot-air balloon rise? Athe balloon is magneticBthe wind pushes it up onlyCthe hot air inside is less dense than the cooler air outsideDgravity stops working Check my answer Source: Thuto360 practice Report a problemWhat's wrong?The marked answer is wrongThe question is unclearA spelling or typing mistakeThe picture is wrong or missingSomething elseAnything to addSend More like thisWhich material is the best insulator for a cooler box?Multiple choiceForm 1Heat
