Noun
extrusive igneous rock solidified near or on the surface of the Earth
Source: WordNetLike perlite, pumice is a lightweight, mined volcanic rock that finds application in hydroponics. Source: Internet
For example, volcanic rock from the Paleogene and Neogene periods (66 million - 2.6 million years ago) occurs in the San Juan Mountains and in other areas. Source: Internet
The area to the north of the Sea of Galilee, including Capernaum and Chorazin, is covered by black layers of volcanic rock. Source: Internet
Perlite is a volcanic rock that has been superheated into very lightweight expanded glass pebbles. Source: Internet
Charnwood Forest is noted for its abundant levels of volcanic rock, estimated to be approximately 600 million years old. Source: Internet
It has uneven bottom covered with boulders of volcanic rock. Source: Internet