premise: Cape Verde is a volcanic archipelago situated above an oceanic rise that puts the base of the islands 2 km above the rest of the seafloor. Cape Verde has been identified as a hotspot and it has been argued that a mantle plume might be underneath it causing the volcanic activity and associated geothermal anomalies.
hypothesis: Cape Verde is names after a color
reason: IT could be named after a color (verde=green) or maybe not.