21. This volcanic region is surrounded by mountain peaks and is covered by black volcanic rock, or basalt. 22. But the gorilla's habitat spread over volcanic regions in Uganda, Congo and Rwanda also hides Rwandan rebels. 23. In February 1992, a scientific team led by Greer went to a volcanic region outside Mexico City. 24. Delamination may thus account for some volcanic regions that have been attributed to mantle plumes in the past. 25. Farneseite has only been reported from its type locality of Latium, which is a volcanic region in Viterbo, Italy. 26. Swarms, which occur in volcanic regions " start with one quake, build to a crescendo and then die off," 27. During extensive travels in the 1900s, Hitchcock explored the volcanic regions of island of Maui in 1915 and 1916. 28. Marie Byrd Land contains the largest volcanic region in Antarctica, covering a length of almost along the Pacific coast. 29. Meanwhile he began to study the volcanic regions of central France in 1821, and visited the Eifel district in 1823. 30. Southwest of the Hawran lies the high volcanic region of the Jabal al-Druze range home of the country's Druze population.
