Basalt.
Obsidian
Igneous Rock.
Extrusive igneous rock is formed from rapidly cooled lava at Earth's surface. Examples are obsidian and basalt.
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it is called pumice.
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They are formed when the erupted magma or lava, cool and sollidifies below or above the earths surface respectively.
When lava cools and solidifies, it is called igneous rock. The specific type of igneous rock formed depends on the composition of the lava and the cooling process. For example, basalt is formed from rapidly cooled lava, while granite is formed from slowly cooled magma beneath the Earth's surface.
Lava turns black once it starts to cool off because of the materials that it has inside. The classic images of lava depict basaltic lava, which is the most common type. It cools to form a frock called basalt, which is black largely due to the presence of pyroxene minerals.
it is called an extrusive rock