All the answers are correct look at a map.
Referring to a particular type of population in a country or area, you are referring to all the people or animals of that type there.
A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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Answer:
The European settlement in the Americas from 1500 to 1790 was most often voluntary migration.
Explanation:
Voluntary migration; is correct because the vast majority of the people from Europe that migrated to the Americas in this period migrated voluntarily, be it because of economic reasons or because of their adventuristic nature.
Internal migration; is not correct because this is a migration that happens within the borders of a country.
Interregional migration; is not correct because the migration was going only in one direction, but in several regions from multiple regions.
International migration; is not correct because the migration was limited, a lot of people from other parts of the world were not allowed to.
Forced migration; is not correct because this was not the principle used for this particular migration.
