Shield volcanoes are characterized by their broad, gently sloping shape. They resemble a shield laid flat on the ground, hence their name.

Here's a more detailed description:

* Wide base: Shield volcanoes have a very wide base, often stretching for miles.

* Gentle slopes: The slopes of a shield volcano are very gentle, typically less than 10 degrees.

* Low profile: They are relatively low in height compared to their width.

* Rounded summit: The summit of a shield volcano is usually a broad, rounded area, sometimes with a caldera (a large depression formed by a volcanic eruption).

This shape is due to the fluid, basaltic lava that erupts from shield volcanoes. The lava flows easily and spreads out over large distances, creating the broad, gently sloping form.

Here are some examples of shield volcanoes:

* Mauna Loa in Hawaii

* Kilauea in Hawaii

* Erta Ale in Ethiopia

* Fernandina in the Galapagos Islands