<P> Volcanic rock ( often shortened to volcanics in scientific contexts ) is a rock formed from magma 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 . </P>
<P> Volcanic rock ( often shortened to volcanics in scientific contexts ) is a rock formed from magma 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 . </P>
what type of rocks form when lava cools after a volcanic eruption
what type of rocks form when lava cools after a volcanic eruption
Volcanic rock
Volcanic rock