Verdadeiro: Tsunamis are caused by seaquakes., Paper was invented in China., Greenhouse gases are produced by man., Tons of paper are recycled per year., Plastic is made from oil., Falso: Trees is cut down to make farmland., Wood are used to produce coal., Some islands is formed by volcanic eruption., Plastic bags were ban in San Francisco in 2007., Sometimes wildfires is caused by human activity.,

#3 U4 Passive voice

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