Most environmental problems result from
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The world human population reached 1 billion in about
The world human population reached 1 billion in about
Hazardous substances ______________ while toxins are _______…
Hazardous substances ______________ while toxins are ______________.
Smelting releases metals from ore.
Smelting releases metals from ore.
A giant sea swell known as a tsunami is caused by
A giant sea swell known as a tsunami is caused by
Raw sewage would contribute to the biochemical oxygen demand…
Raw sewage would contribute to the biochemical oxygen demand of a stream and cause fewer organisms to be present.
The amount of CO2 released by human activities per year is a…
The amount of CO2 released by human activities per year is approximately ___________.
A more sustainable form of managing grasslands is
A more sustainable form of managing grasslands is
The most abundant element in the Earth’s crust is _________.
The most abundant element in the Earth’s crust is _________.
________ is/are examples of secondary pollutants.
________ is/are examples of secondary pollutants.