Igneous rock could appear anywhere on Earth.
igneous rock
The color of the rock that forms oceanic crust at mid-ocean ridges is dark gray to black. The rock is primarily basalt, which is a type of igneous rock formed from the solidification of molten lava.
The mid-ocean ridges are made almost entirely of basalt, because this is where new oceanic lithosphere is being formed. In fact, oceanic plates in there entirety are made up almost entirely of basalt.(igneous rock)
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Basalt is extruded from volcanoes and MOR (mid ocean ridges). It actually forms in the earth's mantle and just solidifies on the earth's surface.
The ocean floor is primarily made up of basalt rock, which is a type of igneous rock formed from solidified lava. Basalt is dark in color and forms through volcanic activity at mid-ocean ridges and hotspots.
Igneous rock is formed from the cooling and solidification of magma and lava. Volcanic mountains and underwater mid-ocean mountain ridges would contain igneous rock, as well as uplifted igneous intrusions.
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Three methods of intrusive igneous rock formation are magma cooling and solidifying deep within the Earth's crust, magma forcing its way into existing rock formations and solidifying, and magma being injected into cracks and crevices in the surrounding rocks and cooling to form igneous rocks.
Mid-ocean ridges are basically underground volcanoes that lava from the Earth's Mantle can breach. The ocean, however, freezes the lava and that in turn forms rock. If this happens repeatedly, then the older rock gets pushed away from the source, and the younger, just formed rock is, therefore, closer to the ridge. So the younger rock being formed by the ridge is pushing away the older, previously made, igneous rock.
Mid-ocean ridges are basically underground volcanoes that lava from the Earth's Mantle can breach. The ocean, however, freezes the lava and that in turn forms rock. If this happens repeatedly, then the older rock gets pushed away from the source, and the younger, just formed rock is, therefore, closer to the ridge. So the younger rock being formed by the ridge is pushing away the older, previously made, igneous rock.
Areas such as the mid-ocean ridges, volcanic arcs, and hotspots have extensive igneous rock records due to ongoing volcanic activity. Additionally, regions with ancient shield volcanoes, like the Canadian Shield and Fennoscandian Shield, also contain large amounts of igneous rocks from past volcanic activity.