Answer:Here’s the classification of each item into Earth's four spheres:1. Frog - Biosphere2. Clouds - Atmosphere3. San Fabian Beach - Hydrosphere4. Mt. Balungao - Geosphere5. Satellites - Atmosphere (due to their location in Earth's upper atmosphere)6. Inner Core - Geosphere7. Mango Tree - Biosphere8. Agno River - Hydrosphere9. West Philippine Sea - Hydrosphere10. Meteors - Atmosphere (when they enter Earth’s atmosphere)11. Carabao - Biosphere12. Sand dunes - Geosphere13. Valley - Geosphere14. Sunflower - Biosphere15. Stratosphere - Atmosphere