These diagrams are topographic maps of Mount St. Helens in Washington state. They were made before and after the volcano erupted in 1980. What do these two maps tell us about the eruption?

The more dense middle part of the after-eruption topographic map shows the concentration of new mountains as a result of the volcanic eruption.
A topographic map refers to map that shows the shape and elevation of the land surface features through the use of contour lines.
In the map in question, we will observed the contours lines is more dense in the after-eruption map than former.
In conclusion, the more dense middle part of the after-eruption topographic map shows the concentration of new mountains as a result of the volcanic eruption.
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