What happens when forests are burned?a) Stored carbon is released back into the air b) More oxygen is created c) Carbon disappears forever d) The air becomes cleaner

Why was plastic a good solution when it was first invented? a) It was expensive and rare b) It replaced animal products, saving animals c) It could only be used once d) It dissolved in water

Which method is best for separating sand from water?  a) Hand picking b) Sieving c) Filtration d) Winnowing

What happens in a series circuit if you remove one bulb?               a) The other bulbs stay lit b) The other bulbs become brighter c) The other bulbs go out d) Nothing changes