Can I assign different colors/styles to different geometries in a MultiGeometry element?
The MultiGeometry element groups geometries together in the same Placemark element. This allows the geometries to share the same styling and to appear as one item in a list such as the My Places pane in Google Earth. Styles are set at the Placemark level, either using a styleUrl element or a Style element. Therefore, individual geometries in that Placemark cannot have different styles. A frequently used workaround is to create a separate Placemark for each geometry, allowing each one to have a different style. To prevent a proliferation of items in a list, place them in a Folder that has a ListStyle with a listItemType with checkHideChildren. In Google Earth, for instance, this places all the Placemarks in the same folder element in My Places, and prevents the user from opening it up to display a large number of elements.