Obsidian
The types of rock that forms when this occurs is called an igneous rock. However, there are two types of igneous rocks that can form depending on how fast the cooling occurs. These are extrusive and intrusive rocks. While extrusive rocks form from fast cooling, intrusive rocks form from slow cooling.
Obsidian is a glassy rock formed from quick cooling lava.
When lava cools extremely fast it forms volcanic glass, better known as obsidian. This often occurs when lava hits water.
Volcanic glass.
Obsidian
obsidian :)
Obsidian
Obsidian
Obsidian.
igneous rock is formed when lava cools down
When a magma cools/solidifies, crystals are formed. The quicker the magma cools, the tinier the crystals. A granite for example, which is formed through slow cooling in the Earth's crust, consists out of big crystals. Contrary, magma erupting at the surface (which is then called lava) cools rapidly and consists out of tiny crystals. In extreme cases, the lava cools so rapidly that the resulting rock appears glassy. Hope this helps!
Pumice.
Extrusive igneous rock is formed from the crystallization of minerals as the lava cools.
Smooth glassy rock that forms when lava cools
Obsidian.
glassy texture
igneous rock is formed when lava cools down
When a magma cools/solidifies, crystals are formed. The quicker the magma cools, the tinier the crystals. A granite for example, which is formed through slow cooling in the Earth's crust, consists out of big crystals. Contrary, magma erupting at the surface (which is then called lava) cools rapidly and consists out of tiny crystals. In extreme cases, the lava cools so rapidly that the resulting rock appears glassy. Hope this helps!
Pumice.
Igneous rocks are formed when lava cools. After a eruption, the lava cools, and the igneous rock is formed.
Obsidian is an glassy, extrusive, igneous rock that is found in areas that have experienced rhyolitic eruptions. Obsidian is formed when the rhyolitic lava comes into contact with water. This quick-cooling results in the glassy texture of obsidian.
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..
When lava cools and solidifies.
The answer is pitchstone. it is and igneous rock.