1. The document discusses the importance of co-curricular activities like geological museums and planetariums in enriching the curriculum and aiding student development. 2. A geology museum organizes real objects and materials to provide valuable information about the past and supplements classroom teaching by serving as a reference. 3. A planetarium uses a dome and projector to display realistic images of celestial bodies and allows viewers to observe projections of the sun, moon, planets and stars along with narration and sound effects.