Basaltic volcanoes with gently sloping sides are called shield volcanoes.

Here's why:

* Basaltic lava: This type of lava is very fluid and flows easily, spreading out over large areas.

* Gentle slopes: The fluid lava creates broad, gently sloping cones. This is in contrast to stratovolcanoes, which have steeper sides due to their more viscous lava.

Some famous examples of shield volcanoes include:

* Mauna Loa in Hawaii

* Kilauea in Hawaii

* Olympus Mons on Mars