ANSWER:
Rivers are very important for a country's economy as many trades take place through rivers .
Also many new ideas and comodities spread across the eorld through sea routes .
Also ideas of new technologies,achievements in medical science get across the world through rivers and seas.
Even sometimes some special things that need to taken from one country to another with high security are taken through rivers.
There can be many more reasons for rivers being important for a country's economy.
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Answer:
Population
Explanation:
Migration rates, birth rates, and death rates are always used to measure changes in the population of a region or place.
These parameters are tools for construing population dynamics.
- Migration rates are the number of immigrants coming into a place and the number of emigrants moving out of a place.
- Birth rates are the total number of birth per thousand of population per year.
- Death rates are the total number is the number of deaths in a locality.
- It is also called mortality rate.
Since death, birth, and movement are the key parameters that determine changes in population they, in turn are used to measure changes in population.
Frost wedging among the following choices given in the question is as a result of a change in pressure. The correct option among all the options given in the question is the first option or option "A". When the cracks of rock layers containing water freezes during the night, this causes the pressure within the cracks to increase causing frost wedging.
