Yes, the heat of the lava may well turn some of the water into steam, but the sea will cool & solidify the lava.
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
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.
Molten rock from under the surface (called 'magma') that reaches the Earth's surface and flows out is is called 'lava'.
Lava.
lava is rock that is in its molted form ,lava is what magma's called when it reaches the surface.
Molten rock is called magma when it is underground and 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.
Magma is called lava when it reaches the surface.
Before lava reaches the surface it is called magma.
Lava cools down and accumulates into rock as it reaches Earth's surface