Submerged basaltic volcanoes that are higher than 1 km are called seamounts.

Here's a breakdown:

* Basaltic: Means the volcano is made primarily of basalt, a dark-colored volcanic rock.

* Submerged: Means the volcano is located beneath the surface of the ocean.

* Higher than 1 km: This is a common defining characteristic of a seamount.

While not all seamounts are basaltic, most are. There are also other terms used to describe specific types of undersea volcanoes, such as:

* Guyots: Flat-topped seamounts, often formed by erosion from waves.

* Volcanic islands: Seamounts that rise above sea level.

Let me know if you have any other questions about underwater volcanoes!