Question

Since the development of accelerator mass spectrometry, these species have been the standard tool for surface exposure dating. For 10 points each:
[10h] Name these species produced in the atmosphere and in minerals on the Earth’s surface by the interaction of nuclei with cosmic rays.
ANSWER: cosmogenic radionuclides [or cosmogenic radioactive nuclides or cosmogenic radioisotopes or cosmogenic radioactive isotopes; prompt on radionuclides, radioactive nuclides, radioisotopes, or radioactive isotopes]
[10e] This isotope, beryllium-10, aluminum-26, and chlorine-36 are the most common cosmogenic nuclides used in geological research. This isotope’s half-life of about 5,730 years is used to date organic material.
ANSWER: carbon-14 [or 14C; prompt on radiocarbon dating]
[10m] Surface exposure dating with cosmogenic nuclides can be applied to depositional landforms such as these cone-shaped accumulations of sediment that form as water exits a narrow canyon into a basin.
ANSWER: alluvial fans [accept debris-flow fans; accept fluvial fans or distributive fluvial systems; prompt on fans]
<Other Science>

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Data

TeamOpponentPart 1Part 2Part 3Total
Berkeley ANorthwestern0101020
BrownMaryland0101020
Chicago AWUSTL A0101020
Chicago DBerkeley B0101020
Columbia AChicago B0101020
Columbia BPenn010010
Cornell AStanford010010
DukeClaremont Colleges010010
FloridaArizona State0101020
HarvardCornell B010010
IndianaWaterloo010010
Iowa StateGeorgia Tech0101020
Johns HopkinsYale A0101020
Minnesota BMcGill010010
NYUIllinois0000
North Carolina ATexas010010
North Carolina BVanderbilt0000
PurdueMinnesota A010010
RutgersWUSTL B010010
South CarolinaKentucky010010
Toronto AMichigan010010
Truman StateChicago C010010
VirginiaToronto B010010
Yale BOttawa010010

Summary

TournamentEditionExact Match?HeardPPBEasy %Medium %Hard %
2024 ACF Nationals04/21/2024Y2412.5092%33%0%