168 



PHYSIOGRAPHY 



The crater of Mauna Loa is 3 miles long, 2 miles wide, and about 

 1,000 feet deep, a very large crater. When the volcano is not 



MAP 



01 



HAWAII 



SCALE cr 'STATUTE MILES 



Fig. 169. Map of Hawaii. (U. S. Geol. Surv.) 



active, it is possible to go down into the crater and to walk about 

 on its hard, hot floor. Cracks and other openings are, however, 

 generally present, and give evidence of the hot liquid rock beneath. 

 Before an eruption, the floor of the crater rises, and lakes of 

 lava appear in the enlarged openings in it. At intervals, fountains 





