According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on Earth?
A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth.
B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life.
C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life.
D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
D
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Indicate whether the statement is true or false
An alloy of 73.9 atomic % tin (Sn) and 26.1 atomic % lead (Pb) is mixed and heated to 250°C. See the lead tin phase diagram in Figure 5.11a.
(a) At 250°C what phases are present, what are their chemical compositions, and what is the atom fraction of each phase?
(b) This Pb-Sn mixture is then cooled to room temperature (25°C). What phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
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What will be an ideal response?
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above