rissamarie7261 rissamarie7261

11-02-2018
Biology

contestada

We now know that the warming of the earth in the last 200 years is largely due to humans and their effects on:

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theking1315 theking1315

11-02-2018

the ozone layer, it keeps the UV rays out but because of us humans and the chemicals we release it is breaking down the molecules and now some harmful UV rays can come onto the earth surface

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