Volcanic rock
Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks. For these reasons, in geology, volcanics and shallow hypabyssal rocks are not always treated as distinct. In the context of Precambrian shield geology, the term "volcanic" is often applied to what are strictly metavolcanic rocks. Volcanic rocks and sediment that form from magma erupted into the air are called "volcaniclastics," and these are technically sedimentary rocks.

Volcanic rocks are among the most common rock types on Earth's surface, particularly in the oceans. On land, they are very common at plate boundaries and in flood basalt provinces. It has been estimated that volcanic rocks cover about 8% of the Earth's current land surface.
Q8063
rock
Concept
Q40157
lava
Concept
Q8072
volcano
Concept
Q42045
igneous rock
Concept
Q8072
volcanic
Concept
Q2323389
hypabyssal
Concept
Q47069
metamorphic rock
Concept
Q180184
sediment
Concept
Q82480
sedimentary rock
Concept
Q103910
Precambrian
TIME
Q852013
shield
Concept
Q6823306
metavolcanic rock
Concept
Q42278
magma
Concept
Q13410264
flood basalt province
Concept
Q108689
Volcanic rock
Concept
Q108689
Volcanic rock
Concept
Q108689
Volcanic rock
Concept
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
subclass of
made from material
part of