Answer:
Fossil records and carbon contents.
Explanation:
- The type of the sedimentary that are present in the Himalayas were the marble, dolomite and silts stone and shale and limestone as per the geologic records the carbon dating of the rocks reveals there ages as per the data collected from the accumulation of the sediments. The upliftment of seas and also the fossil life of the plants and animals that were found during that period.
France, Spain and Greece are not examples of countries where the North and the South differ greatly: they have all experienced economic problems recently, but this was not specific to the Southern areas of their countries. .
The correct answer is Italy: there is a big difference between the North and the South of Italy, including a cultural difference.
Set this up as
10 = 40 (1/2)t/28
and solve for t in years.
10/40 = (1/2)t/28
log(0.25) = (t/28) log(0.5)
t = 28 log(0.25) / log(0.5) years = 56 years
Test the answer:
56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.