A large volcano with gently sloping sides is called a shield volcano.

Here's why:

* Gently sloping sides: Shield volcanoes are formed by highly fluid lava flows that spread out over large areas. This creates the characteristic broad, gently sloping shape.

* Large: They are typically the largest type of volcano, with some reaching enormous sizes.

Examples of shield volcanoes include:

* Mauna Loa in Hawaii

* Kilauea in Hawaii

* Mount Etna in Italy