Which use of iron is due to its chemical properties? producing colored sparks in fireworks
changing from liquid to gas at 2,862°C
conducting electricity and heat
changing from solid to liquid if heated to 1,538°C

9. technology can bring both good and bad things. building a vertical farm can increase food supplies in cities (good), but it may cause unemployment in rural areas (bad). give another example of both the good and bad sides of a technological advancement (5 noints)