I believe the answer is: Formal region
Each formal region would be differentiated by their own unique government structure that separate each region with the other. Each border on the sides of each region would consist of some sort of boundaries ( could be natural or human made) that accepted by all regions as a legal separation between their jurisdiction.
During World War I, 116,516 US soldiers were killed and 204,002 were wounded. If you add those two numbers together, the total number of US soldiers killed or wounded was 320,518.
You can represent that as a fraction of the current population of Chicago like this:

For simplicity's sake (since I assume the Chicago population number is an estimate), let's round the number of soldiers killed or wounded down to 300,000. That would look like this:

We can simplify that down a lot by dividing the number of soldiers and the number of Chicagoans by the least common denominator of 300,000. That would give us this fraction:

So for every 1 US soldier killed or wounded in World War I, there are 10 Chicagoans living in the city today.
Answer:
No I dont think so
Explanation:
Speaking from the view of those things (tsunami volcanic eruption) I do not think there Can be any reduction because the volcanic eruption is actually from under the earth's crust and there's no possible way to stop it if I'm not mistaken the only thing I'm sure about is that climate Change is taking place and this things tend to happen if not taken strictly seriously
From my point of view though
Answer:
E, The economy is in a recessionary gap when the short-run equilibrium real output is above the long-run equilibrium real output.
Explanation:
See attached picture.
Diagram is from Andrew McCarthy's "Digging a Little Deeper" website/ blog.