t’sThe word extrusive means exterior. this means it is something on the outside. That is why extrusive volcanism is when volcanic activity takes place above the ground. It is outside the Earth instead of inside it. The hot magma escapes the Earth’s crust. Once the magma has reached the surface, it is then called lava.
Lava Can Build…
This type of volcano forms a big short volcano that is lower to the ground than the others.
…It Can Also Be Destructive
The Krakatoa Eruption
The island of Krakatoa’s volcano is an example of this. In 1883, the volcano erupted and caused a lot of damage to the island. Only the ocean was left behind! People as far as 1,500 miles away were able to hear the explosion, and lots of dust filled the sky all over the world!
Other Useful Resources:
Extrusive Igneous Rocks: http://www.mineralogy4kids.org/rock-cycle/extrusive-igneous-rocks
‘Volcanism Facts:’ https://wiki.kidzsearch.com/wiki/Volcanism
Lesson on the Types of Igneous Rocks: https://www.ck12.org/earth-science/Intrusive-and-Extrusive-Igneous-Rocks/lesson/Intrusive-and-Extrusive-Igneous-Rocks-HS-ES/