Universe and global climate — Advanced

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Level 3: Advanced

Evaluate, justify, synthesise, propose — combine ideas, judge claims and methods (senior secondary style).

1. A commentator says the Big Bang is “just a guess” because nobody was there. The strongest scientific reply is:

   A)Fair — without eyewitnesses, historical science must rely on imagination, not dataB)Too weak — redshift, CMB, light elements, and large-scale structure independently test the same broad pictureC)Reasonable — cosmology should admit only human testimony, not indirect signaturesD)Accurate — nearby galaxy light lets us replay the first minutes like a film

2. Evaluate: Because one climate model simplified cloud physics, all projections of future warming are worthless.

   A)Reasonable — one flawed cloud scheme poisons every downstream output, so the whole stack failsB)Too strong — models are checked against data, and forcing, paleoclimate, and patterns add separate constraintsC)Partly true — coupled models are mainly statistical fits, not rooted in conservation or radiative transferD)Sound — every model now agrees on cloud feedback sign and magnitude, so doubt is obsolete

3. A student argues we should dismiss human-caused greenhouse gas trends because weather was cold last week. The best critique is:

   A)Weekly forecast statistics are the same evidence base as multi-decadal climate assessmentsB)A regional cold spell proves radiative forcing paused for that monthC)Weather is short-term variability; climate trends need long records and broad indicatorsD)CO₂ is too light to remain in the troposphere more than a few days

4. To justify using both models and observations in climate science, a researcher would most likely say:

   A)Models are curve fits only, so they cannot encode radiation laws or fluid dynamicsB)Good instruments make theory optional, because numbers alone settle every climate questionC)Expert agreement can replace open data, code, and replicated methodsD)Models embed physics and data, are tested against observations, and probe futures together

5. Evaluate “If models disagree on cloud feedback, we know nothing about future warming.”

   A)Fair — unsettled clouds erase confidence in any greenhouse-gas–driven warmingB)Too strong — ranges stay bounded; forcing, paleoclimate, and responses still narrow outcomesC)Misguided — clouds change albedo but sit outside Earth’s radiation budgetD)Seasonally limited — the claim holds in winter hemispheres but not in summer

6. Synthesise how biosphere–atmosphere exchanges matter for year-to-year CO₂ growth rate:

   A)Terrestrial uptake is negligible, so land cannot shift annual CO₂ incrementsB)Ocean biology alone sets airborne carbon; land ecosystems are a rounding errorC)Photosynthesis, respiration, fire, and land-use shifts nudge how much CO₂ accumulates yearlyD)Volcanic degassing alone explains the wiggles in annual atmospheric CO₂ growth

7. Critique using a cold winter in one region as proof that global warming has stopped:

   A)It swaps a local cold spell for global, multi-decadal temperature behaviourB)It is strong evidence if snow fell once, even when global means keep risingC)It is sound whenever the jet stream meanders, without comparing to baseline trendsD)It is backed by satellites automatically, provided no one applies long-term averaging

8. Justify teaching the Big Bang as a scientific model rather than a casual guess:

   A)It rests on no observations, so classrooms should keep it speculative onlyB)Its main success is explaining lunar phases, not wider cosmic historyC)Redshift measurements falsified the model, leaving only non-scientific narrativesD)Expansion, CMB, light elements, and large-scale structure independently support it

9. A student says one team’s cosmic distance measurement settles the entire history of the universe. The best classroom response is:

   A)Treat one group’s value as settled law without waiting for replicationB)Science cross-checks methods and data; single numbers rarely close every open question aloneC)Dismiss the result because massive galaxies should slow expansion everywhere equallyD)Use distance labels and dark-matter labels interchangeably because both sound technical

10. Propose why paleoclimate proxies (ice cores, sediments) complement instrumental records:

    A)They reach eras before instruments and test how forcings and feedbacks behaved in the pastB)They supersede thermometers and satellites once a single core is drilledC)They resolve rainfall for one field only, with no broader climatic meaningD)They resist calibration, so scientists cannot compare them with modern data

11. Evaluate because cosmic expansion stretches space, every bound system like a classroom must be ripping apart visibly.

    A)Sound — binding energies are negligible, so desks drift apart measurably each yearB)Plausible — Hubble flow appears indoors as gentle drafts you can feel on your skinC)Too strong — bound systems ignore the cosmological scale factor; expansion matters on huge scalesD)Wrong mechanism — cosmic expansion alters sound speed, not the spacing of solid objects

12. Justify using multiple independent lines for anthropogenic warming rather than one graph:

    A)A single well-chosen plot can settle the whole debate without corroborationB)Radiative physics, paleoclimate, patterns, models, and fingerprints cross-check one anotherC)Complex models make field data optional once the code compiles successfullyD)Instrument networks are so sparse that only one thermometer record really matters

13. Critique if one climate model run is wrong on rainfall in one region, greenhouse-gas physics must be wrong.

    A)Fair — a bad rainfall map invalidates infrared absorption tables in the same buildB)Fair — one region’s precipitation error means the planetary energy budget failedC)Fair — coupled models omit radiative transfer, so greenhouse physics was never includedD)Too strong — regional rain is noisy; well-mixed gases and many tests still anchor the big picture

14. Synthesise ocean heat content as evidence alongside surface air temperature:

    A)Much recent heat gain sits in the ocean; air temperature alone is an incomplete pictureB)Ocean heat content is flat, so subsurface probes must be biased high systematicallyC)Land surface trends alone capture the full planetary energy imbalance without oceansD)Thermal expansion is unrelated to ocean warming, so sea level omits that signal

15. A student says the Big Bang is believed only because textbooks repeat it. The fairest reply is:

    A)Fully accurate — textbooks never cite observations, only authorityB)Proven false — one spectrum now replaces redshift, CMB, and abundances togetherC)Incomplete — independent observations (redshift, CMB, light elements, structure) converge on the modelD)Harmless shorthand — the name is a typo scientists keep for historical reasons

16. Propose why attribution studies compare model worlds with and without human forcings:

    A)So simulations can substitute for direct measurements in every published figureB)To test whether observed trends fit a natural-only world versus one that includes human driversC)To discard formal uncertainty estimates and report single best-guess lines onlyD)To show that daily weather maps are interchangeable with climate projections

17. Justify concern about irreversible or committed ice-sheet change even if equilibrium warming stabilises:

    A)Ice sheets equilibrate within seconds once air temperatures stop risingB)Polar ice is permanently below melting point, so warming cannot reduce land iceC)Sea-level budgets exclude ice sheets, focusing only on thermal expansionD)Threshold crossings and inertia can commit coasts to further rise after forcing levels off

18. Synthesise mitigation and adaptation in climate policy language:

    A)They are synonyms used interchangeably in treaties and national plansB)Adaptation strictly means ending emissions, while mitigation means building seawallsC)Mitigation targets emission drivers; adaptation limits harm from impacts already underwayD)Both are slogans unrelated to physical climate science or risk management

19. Evaluate we should ignore satellite data because one satellite record once needed correction.

    A)Defensible — one revised retrieval should discredit the entire remote-sensing recordB)Too strong — methods evolve; cross-calibration and many sensors tighten confidenceC)Off-target — orbital platforms only track stars, not Earth radiation budgetsD)Inaccurate — scientific norms forbid revising algorithms after instruments launch

20. Evaluate the claim: The greenhouse effect means Earth sends no infrared energy out to space.

    A)Accurate — greenhouse gases trap all infrared, so Earth cannot cool radiativelyB)Fair — satellites show essentially no thermal emission leaves the atmosphereC)Too strong — Earth still radiates to space; gases change retention and emission height, not a perfect sealD)Irrelevant — the planetary balance depends only on reflected sunlight, not infrared

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