A rock formed from a mass of magma that flowed out on the surface of Earth. Example: basalt.
Igneous rock formed from lava that solidifies on are near the earth's surface
A type of igneous rock that forms from magma after it has erupted onto the surface of the earth.
Rock formed from magma that has erupted explosively or has flowed onto the earth's surface from a volcano (see Volcanic Rock).
Igneous rock that has been formed from the hardening of lava on the crust of the earth.
An igneous rock formed from lava that has flowed out onto the Earth's surface, characterized by rapid solidification and grains that are so small as to be barely visible to the naked eye.