compare these to population pyramids of Costa Rica Write a brief paragraph explaining the two pyramids.

In the Case that these graphs are showing the number of people who are alive: Basically, the death rate in Costa Rica has lowered between 1990 and 2015. This is a good thing, because of how large the 2015 graph is compared to 1990.

Explanation:

You would write about how things in costa rica must have improved because the graphs show that more people in their later years are alive. Maybe the medical technology improved? Maybe there is less poverty? A lot of different factors like those could cause this change to occur. Good Luck!

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.