A) Every Pb2+ atom detected in the zircon sample must be the result of radioactive decay, while some Pb2+ atoms found in sphene could have been incorporated during its formation.
Explanation:
The reason why the geochemist will prefer to use the ziron which takes the 4+ cation would be because, every Pb2+ atom detected in the zircon sample must be the result of radioactive decay, while some Pb2+ atoms found in sphene could have been incorporated during its formation.
✓ The Pb 2+ produced the daughter isotopes of the radioactive decays.
✓ To properly date the rock sample, any external source of the daughter isotopes should be eradicated.
✓ This will help to establish a fair ratio between the parent and daughter isotopes in order to track the decay rate.
✓ This is why the Zircon would be preferred to the Sphene.
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Answer:
Spreading, Subduction
Explanation:
The areas in which new sea floor and oceanic lithosphere are formed are called spreading centers, and the areas where older oceanic lithosphere is recycled as it descends and melts are called subduction zones.
Answer:
Mercury
Explanation:
The terrestrial planets are the first four: Mercury, Venus, Earth and Mars. Out of these four, Mercury is the smallest.
Answer:
Debt relief is when debts are either reorganised to make them more manageable, or reduced. Microfinance loans are when money is lent to LICs to help them to develop. These are often small loans with reasonable interest rates. They are available to people and businesses who may normally struggle to get credit.
<span>The name of the envelope of gases that surrounds earth is called </span>Atmosphere