688 



DYNAMICAL GEOLOGY. 



which are given in figure 967, are mainly lava-cones, and the gene- 

 ral slope is 6 to 8 degrees. (These two figures are parts of one pro- 

 Fig. 968. 



Map of part of Hawaii. 



file view of the island, the two joining at B.) Etna has a similar 



Fig. 969. 



Crater of Kilauea, in 1840: a, large boiling lake of lava; at o and near e, sulphur-banks ; r, 

 an adjoining small crater; p, neck between Kilauea and the crater r. 



low inclination. A horizontal section of Mt. Loa, 1800 feet below 

 its top, would be nearly twenty miles broad. 



In true lava-cones, like Mt. Loa, the crater is generally a pit-crater, 



