1. Fretting, among other things, is done by streams eroding their rocky beds.
2. Crystallography (index, lattice, chart and law).
3. Blackdamp is the only one of these mine gases that reliably snuffs flame.
4. Air, ice, water and gravity.
5. Under the ocean—they're seamounts.
6. Maria are recognized on Mars and Titan.
7. Only gannister, a type of sandstone, is not a sediment.
8. On aretes, where these rock spires block mountain climbers.
9. The Cocos plate, just off Puerto Escondido.
10. They're gemstone names for garnet.
11. Karrenfeld is not a desert landform.
12. Kullerudite is nickel selenide.
13. They are types of lava bombs.
14. The Silurian Period includes four epochs, none named "Middle."
15. China stone is not a form of quartz.
16. They're names of cycles (in sediments, supercontinents, sunspots and Earth orbits).
17. All are parts of a brachiopod.
18. Popigai, fourth-largest on Earth, is 100 km across.
19. R is for Rayleigh seismic waves, which arrive after P (primary), S (secondary) and Love waves.
20. Majorite is not an amorphous mineral.
Any questions, quibbles, expostulations? The comments are open. Thanks for playing.
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