Create 10 practical approaches for designing interdisciplinary project-based learning in school that support teachers in meaningfully connecting different subject contents and enabling students to have a holistic learning experience.

Context: [interdisciplinary, project-based learning, school, interdisciplinary learning, teamwork, practical relevance, learning motivation, competence orientation, lesson development, methodological diversity]

Goal: [promotion of connected thinking, practical and action-oriented learning, strengthening social and self-competences, varied lesson design, sustainable transmission of knowledge and skills]

For each approach, explain:
1) a concrete project idea or procedure for interdisciplinary implementation including involved subjects and learning objectives
2) necessary materials, organizational notes, and possible challenges
3) tips for differentiation and adaptation to different age and performance levels

The approaches should:
- be suitable for various school levels (elementary to secondary)
- consider both in-person and hybrid teaching formats
- support teachers in planning and conducting projects
- promote collaboration within the teaching staff and ensure practical feasibility