Encara no tenim significats per a "fragmental materials".
1But the most important fragmental materials are those derived from the lava itself.
2The cone-building stage may be said to continue until eruptions of lava and fragmental materials cease altogether.
3At the present time the fissure is traced by a line of several hundred insignificant mounds of fragmental materials which mark where the lava issued.
Aquesta col·locació està formada per: