The is a phenomenon that may be caused by the burning of fossil fuels, which increases the co2 content in the earth's atmosphere

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The is a phenomenon that may be caused by the burning of fossil fuels, which increases the co2 content in the earth's atmosphere.

The acid rain is a phenomenon that may be caused by the burning of fossil fuels, which increases the co2 content in the earth's atmosphere.

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Answer volcanic eruptionsseismic waves from earthquakes;

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2