Interactions between water and lava at shield volcanoes can cause some eruptions to become hydrovolcanic. These explosive eruptions are drastically different from the usual shield volcanic activity, and are especially prevalent at the waterbound volcanoes of the Hawaiian Isles.
Axum began to decline in the early decades of the 7th century following the rise and rapid expansion of the Muslim Arabs throughout the Middle East. Both Byzantium and the Persian Empire fell to the Arabs and this dealt a deathblow to the trading endeavours of the Axumite kings. Little is known of what became of the Axumite kingdom between the 8th and 11th centuries. Around the middle of the 11th century the Ethiopian state reappeared as the Christian Zagwe dynasty with its center in the town of Roha in the Amhara region of the Ethiopian highlands.
About 600KMs south west of Addis Ababa lies the widely cultivated Konso land that is embraced by Precambrian serpentines and granites. The Konso peoples speak eastern Cushitic language and are agriculturalists and weavers. These peoples are cryptic beyond visitors' imagination which is demonstrated in the distinctive idealization of the figures and heroic lives of their deceased symbolized with wooden totem.