Extrusive igneous rock is formed from rapidly cooling lava.
Your question asks about the physical than chemical nature. Irrespective of rock type, rapid cooling would produce very fine crystals, and, if the lava is highly gaseous, a lot of vesicles.
Extrusive igneous rock.
Extrusive igneous rock.
igneous rock is formed when lava cools down
Extrusive igneous rock is formed from the crystallization of minerals as the lava cools.
the type of rock formed when lava or magma cools is igneous rock..
Extrusive igneous rock such as basalt forms when lava cools at the earth's surface.
This is known as pumice.
Igneous rock is formed.
igneous rock is formed when lava cools down
pumice
Igneous rocks are formed when lava cools. After a eruption, the lava cools, and the igneous rock is formed.
Extrusive igneous rock is formed from the crystallization of minerals as the lava cools.
the type of rock formed when lava or magma cools is igneous rock..
Igneous rock is formed through the cooling and solidificatio of magma or lava.
Pumice
When lava cools and solidifies.
Pumice rock.
Extrusive igneous rock such as basalt forms when lava cools at the earth's surface.
metamorphic rocks