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:
Option(2) is the correct answer to the given question.
Explanation:
The barometers are used to determine the air pressure at the present location. If the barometers shows high pressure this simply means that weather is clear also the barometers showing the low pressure that directly proportional to the weather is bad.
- In the bad whether there are lots of the chances of raining.
- All the other options are not correct for the bad weather that's why these are incorrect option .
Answer:
The Earth's atmosphere protects and sustains the planet's inhabitants by providing warmth and absorbing harmful solar rays. In addition to containing the oxygen and carbon dioxide, which living things need to survive, the atmosphere traps the sun's energy and wards off many of the dangers of space.
D. new ocean floor
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Answer:
Debt for nature swap
Explanation:
Debt for nature swaps are designed to relieve developing countries of two devastating problems: spiraling debt burdens and environmental degradation .Ina debt for nature swap, developing country debt held by a private bank is sold at a substantial discount on the secondary debt market to an environmental nongovernmental organization (NGO). The NGO cancels the debt if the debtor country agrees to implement a particular environmental protection or conservation project. The arrangement benefits all parties involved in the transaction. The debtor country decreases a debt burden that may cripple its ability to make internal investments and generate economic growth. Debt for nature swaps may also be seen as a good alternative to defaulting on loans, which hurts the country's chances of receiving necessary loans in the future