Yes, the heat of the lava may well turn some of the water into steam, but the sea will cool & solidify the lava.
Molten rock from under the surface (called 'magma') that reaches the Earth's surface and flows out is is called 'lava'.
If it reaches the surface, it is magma or lava. If it merely intrudes into rocks already formed, it is intrusive. Such as sills and dikes.
Lava cools down and accumulates into rock as it reaches Earth's surface
when the lava rock is in the volcanoe it is magma, and when it reaches the outside of the volcanoe it is lava.
lava rock
Molten rock that reaches the Earth's surface is called lava.
When melted rock reaches Earth's surface, it is called lava. Lava can flow out of volcanoes during an eruption, cooling and solidifying to form igneous rock.
lava is rock that is in its molted form ,lava is what magma's called when it reaches the surface.
Magma is liquid rock before it reaches the surface magma which reaches the surface is called lava.
Molten rock is called magma when it is underground and lava when it reaches the surface.
Magma is called lava when it reaches the surface.
Molten rock (magma) that spews from a volcano is called lava, When it cools, the lava forms igneous rocks.