The occurrence of earthquakes and active volcanic islands along the crests of the mid-oceanic ridges can be explained by Hess' model of ocean-floor spreading.
The occurrence of earthquakes and active volcanic islands along the crests of the mid-oceanic ridges can be explained by Hess' model of ocean-floor spreading.
The occurrence of earthquakes and active volcanic islands along the crests of the mid-oceanic ridges can be explained by Hess' model of ocean-floor spreading.