3. Put the words in the right order and write down their sen-tences: • depends / this water / on / on / Earth / life / all. • a / blanket / gases /of / by / surrounded / is / the / Earth. • layer / the / ozone / scientists / are / about / concerned. • lakes / to / protect / we / streams / rivers / can / oceans / help. • the Earth / anyone / can / green / help / to / keep. • greenhouse / trees / fight / help / effect / and us / give / oxy-gen. • April / 22 / day / Earth / inhabitants / of / celebrate / Earth. • air / polluted / for / people / trees / other / plants / but / for / animals / is / not / only bad. • harmful / for / acid / to / plants / is / rain / rivers / live / in / creatures / them.

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