it can cause sparks and even start a fire. - When you put aluminium foil into a microwave,, it turns green over time. - When copper reacts with oxygen in the air, , you get steel. - If you mix iron with carbon,, you get bronze. - If you add tin to copper,, it doesn't change its color to black. - When you heat pure gold,, it melts, gives off toxic fumes and contaminates the food. - When you use a plactic plate as an oven baking tray,, it becomes more flexible but its strength decreases. - When you soak nylon pantyhose (tights),, it returns to its original shape. - If you stretch rubber,, it cracks. - If you expose rubber to sunlight for a long time,, it may crack or shatter. - If you put glass in the freezer,, they don’t crack. - If you heat ceramics slowly,, it becomes very durable. - When concrete fully sets,, it usually rots. - When wood stays wet for a prolonged period of time,, it burns very quickly. - If paper catches fire,, it ends up in landfills where it decomposes and produces methane. - If carboard is not recycled,, it can eventually shrink, lose its color and crack. - If you wash leather in the washing machine,, you make concrete. - If you mix sand, cement, and water,, the friction can start a fire. - If you rub two stone tools or rocks together,,

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