What evidence do geologists study to understand the relative size, severity, or frequency in time of past volcanic eruptions (and other geologic hazards)?

Why did large numbers of african migrate to the americas

Which example gives the relative location of a place? 50 main street 33 degrees n latitude, 91degrees w longitude east of the library 1600 pennsylvania ave., washington, d.c.

How has spanish colonization affected central america? a. english is now the primary language. c. the spanish forced people to become protestant. b. the region is still controlled by spain. d. many people are of mixed ancestry.