Here's why:

* Sloping Sides: Shield volcanoes are known for their broad, gently sloping sides. This shape is due to the very fluid, runny lava that flows out of them, spreading out over a wide area.

* Large: Shield volcanoes are typically very large. The lava flows that build them can extend for miles, creating massive structures.

* Examples: Some famous examples of shield volcanoes include Mauna Loa in Hawaii, Mount Etna in Sicily, and Kilauea in Hawaii.

Let me know if you'd like to know more about shield volcanoes!