Please provide more context! "Ruiz" could refer to several volcanoes.

To help me determine if it's a composite or shield volcano, please specify:

* Which volcano are you referring to? (e.g., Nevado del Ruiz in Colombia, or another volcano with the same name)

* What information are you looking for? (e.g., the volcano's eruptive style, geological features, etc.)

Once you provide this information, I can assist you in determining the volcano's type.