How much of the 238U originally part of Earth is still present?
What will be an ideal response?
Answer: Half of 238U originally part of the Earth is still present because 238U's half life is 4.6 billion years and the earth is around 4.5-6 byo.
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Which two human activities are largely responsible for the observed atmospheric warming?
A. burning of fossil fuels and clearing of forest land B. burning of fossil fuels and growth of urban areas C. burning of rainforests and loss of ice in the Arctic D. cigarette smoking and the explosion of airline travel
Which of the following reactions will consume the most oxygen?
A) complete combustion of one mole of 2,3-dimethylhexane B) complete combustion of one mole of 2,3,4-trimethylpentane C) complete combustion of one mole of octane D) None, they all consume the same amount of oxygen.
What is one of the features of Brazil's economic success?
A) government support for science B) domestic consumption C) natural resources D) all of the above E) none of the above
Your textbook uses the following as its units of measurement
A) Metric B) English C) English and metric