Packet 8: Bonus 7
Morgan and Wilson discovered two large “provinces” under the African and Pacific plates named for displaying this characteristic. For 10 points each:
[10m] What characteristic do seismic waves at “ultra zones” in the D'' (“D-double prime”) layer exhibit as they approach the core-mantle boundary?
ANSWER: low velocity [or low shear velocity or low friction velocity; accept equivalents such as reduced velocity or slow velocity or slowed down or slowing down; accept large low shear velocity provinces or LLSVPs]
[10e] LLSVPs may have formed along with mantle plumes, which underlie these regions of increased volcanism that are responsible for the Hawaiian islands forming.
ANSWER: hotspots
[10h] The prevailing theory of LLSVP formation is that they are accumulations of subducted ocean slabs, supported by a maximum isotopic ratio of this element and strontium called the DUPAL anomaly. Ocean island basalts are primarily classified with strontium, neodymium, and this element.
ANSWER: lead [or Pb]
<MS, Other Science (Earth Science)> | NAFTA-Packet-8
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 33 | 12.12 | 97% | 24% | 0% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Abbas I founded the Abbasids | UBC B | 0 | 10 | 0 | 10 | E |
| UBC A | The Unbearable Heaviness of History Players | 0 | 10 | 0 | 10 | E |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2026 NAFTA at Stanford | 01/17/2026 | ✓ | 4 | 12.50 | 100% | 25% | 0% |
| 2026 NAFTA at UBC | 01/17/2026 | ✓ | 2 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA Online | 02/14/2026 | ✓ | 4 | 12.50 | 100% | 25% | 0% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✓ | 3 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✕ | 5 | 8.00 | 80% | 0% | 0% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✕ | 5 | 12.00 | 100% | 20% | 0% |
| 2025 NAFTA at Harvard | 10/04/2025 | ✓ | 3 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Oxford | 10/11/2025 | ✓ | 4 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✓ | 6 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Columbia | 11/08/2025 | ✓ | 5 | 12.00 | 80% | 40% | 0% |
| 2025 NAFTA at Richmond | 12/20/2025 | ✓ | 2 | 10.00 | 100% | 0% | 0% |