who only by moving can balance

Two essays, three hours, go. That's 10% of the year. (If I remember correctly.)

Here are the prompts we got this year:

1. Impacts.
2. Water and Mars.
3. Molecules and morphology.
4. Forensic geology.
5. Antarctic climate history.
6. Mantle plumes and tectonics.
7. Gold.
8. Sinks and sources.
9. Layered intrusions.
10. The Himalaya Mountains.
11. Isotope fractionation.
12. Siderophile elements in the silicate Earth.
13. The Earth's magnetic field: past, present and future.
14. To frack, or not to frack, that is the question.
15. Seismology and the law.
16. Gutenberg-Richter and the art of noise.
17. Life on exoplanets.
18. Pores, cracks and fluids.
19. Early mollusc evolution.
20. The early Solar System.
21. Climate change is inevitable.
22. Megafloods.
23. G = H - TS.
24. Asteroids.
25. Core-mantle interactions.
26. Mantle rheology and flow.
27. When will the next mass extinction occur?
28. Life and rivers.