Answer:
The god Vulcan’s work for Jupiter
The god Vulcan’s work on weapons
Step-by-step explanation:
These are the two links that the author makes between ancient poetry and volcanic eruptions. The author tells us that: "...Vulcan, the Roman god of fire... was thought to be Jupiter’s blacksmith and responsible for making arrows and shields." He also tells us that people believed volcanoes and eruptions to be due to Vulcan's work and workshop. Therefore, volcanic eruptions were considered linked to the work of Vulcan for Jupiter as well as his work on weapons (arrows and shields).