Extrusive igneous rocks are formed by magma. The magma is crystallized after being pushed to the surface of the Earth. They usually are very fine grained. A really common extrusive rock would be Basalt.
extrusive rocks can form from Basaltic Lava and Andesitic Lava. :)
extrusive
Igneous rocks are classified as either extrusive or intrusive. Extrusive rocks form from lava at or above the ground, and intrusive rocks form from magma below the ground. Granite is intrusive, pumice is extrusive.
Rhyolititcen rocks.
Extrusive igneous rocks are usually fine grained.
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
Igneous rocks are described as intrusive or extrusive based on formation. Intrusive rocks forms underneath the earth surface, while extrusive rocks forms on the surface of earth.
No. A mineral is not inherently extrusive or intrusive. Mica can be found in intrisive igneous rocks and in metamorphic rocks.
Extrusive igneous rocks i think are used for carving and awesome things like that!
Igneous rocks can be categorized as either extrusive or intrusive.
extrusive
where are egneos rocks found