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.
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.
lava
it is called an extrusive rock