they include both moving lava and the resulting solidified deposits of black rock. Lava flows come in a great variety of shapes and sizes. Nyiragongo is considered one of the most dangerous ...

Lava is the word for magma when it erupts onto the Earth's surface. Geologists also use the term to describe the solidified deposits of lava flows and fragments hurled into the air by explosive ...

YAMANAKAKO, Yamanashi Prefecture--Solidified lava from eruptions of Mount Fuji in the distant past offers frightening clues of what awaits if the sacred mountain blows its top again. Researchers ...