Coastline,rivers,and low elevation
A nomad is someone who travels on and on for fresh pasture for farming etc anyways it relates to the spread since they would go from place to place telling people about Islam spreading there religion far and these nomads would tell other nomads and those on and on it was easier to spread than villages since villages are closed up and people don't move but the nomads are constantly moving people
Answer:
i think the answer may be, B
Historical themes help us study history by giving us an idea of what the time period or event being studied was about.
