Answer:
inner core- solid hot rock
outer core- magma that suronds the inner core
When explaining the city growth through the multiple nuclei model, geographers acknowledge that modern cities do not follow strict patterns of growth because of : changes to modern trasnportation
Modern transportation will allow the residences from outside the city to came to the big city and back to their home in a small amount of time
hope this helps
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.
Learn more:
Radioactive brainly.com/question/4207569
#learnwithBrainly
D thats the answer i think