Balearic PAU Geology & Env Sci common mistakes
Balearic PAU Geology & Env Sci · Understand the traps and how to avoid them.
When asked to identify a rock from a written description (grain size, mineralogy, texture, layering), the candidate names the rock class or a generic label such as 'sedimentary rock' or 'volcanic rock' instead of committing to a specific lithology (e.g. 'bioclastic limestone', 'dolerite', 'slate').
Under exam pressure, candidates anchor on the first familiar keyword (e.g. 'layers' → sedimentary) and stop before applying the full classification tree; they fear being wrong on the specific name and retreat to the safe broader category, which earns no identification marks.
What to do instead
Practise a fixed decision routine written out on scratch paper: (1) texture/grain size, (2) dominant minerals or clasts, (3) fabric (foliation, bedding, vesicularity, crystalline vs clastic), (4) then name. Drill with 20 descriptions per rock family until the specific name is the automatic output, and always add the one-line justification (e.g. 'foliated, fine-grained, mica-rich → slate, low-grade metamorphism').
The candidate draws or describes a plate boundary with the wrong relative motion or the wrong stress regime, e.g. labelling the Mid-Atlantic Ridge as convergent, or assigning compressional stress and reverse faults to a divergent margin, and then builds the whole answer (magmatism, seismicity, topography) on that wrong premise.
Boundary types are memorised as labels in isolation from their kinematics; candidates recall 'ridge = new crust' but not 'extension = normal faults = basaltic magmatism', so the causal chain breaks and later parts of the answer contradict the first sentence.
What to do instead
For each boundary type, memorise one causal chain of four links: relative motion → stress regime → fault/structural style → magmatic and seismic signature. Before writing, state the motion in one sentence ('plates move apart, extension') and check every subsequent claim against it. Use a quick sketch of arrows and fault symbols to keep the logic visible.
When explaining the greenhouse effect or a radiative-balance question, the candidate writes that the atmosphere 'traps heat' and stops there, without distinguishing incoming shortwave solar radiation from outgoing longwave terrestrial radiation, without mentioning absorption bands of CO2, water vapour and methane, and without using the energy-balance idea (incoming = reflected + absorbed + emitted).
Everyday phrasing ('heat trap', 'the ozone layer keeps heat in') is repeated from media rather than from physics, and candidates do not realise the examiner is looking for the wavelength distinction and the balance equation, not a slogan.
What to do instead
Write a three-sentence template and reuse it: solar shortwave passes largely through; the surface re-emits longwave; greenhouse gases absorb and re-radiate longwave, raising the equilibrium surface temperature. Practise numerical balance questions (albedo, absorbed vs emitted) and explicitly separate the ozone/UV issue from the greenhouse/longwave issue, since conflating them is a common trap.
The candidate confuses the geological time scale: misordering periods (placing the Jurassic before the Triassic, or the Permian after the Carboniferous), giving wrong boundary ages by an order of magnitude, or using 'era', 'period' and 'epoch' interchangeably in a stratigraphy answer.
The time scale is learned as a list to recite rather than as a nested hierarchy with anchor events; without anchors, the order collapses under stress and the hierarchy terms lose meaning.
What to do instead
Build the hierarchy explicitly (eon > era > period > epoch) and attach one anchor event to each period you must know (e.g. end-Permian mass extinction, K–Pg boundary, first land plants). Rehearse by writing the Phanerozoic timeline from memory weekly and checking ages against a reference; in answers, always name the unit level you are using.
In hydrological or hydrogeological questions, the candidate treats groundwater and surface water as separate systems, ignores the water table and aquifer properties (porosity vs permeability, confined vs unconfined), and answers a recharge/abstraction problem without a water-balance or flow-direction argument.
The water cycle is learned as a labelled diagram of arrows rather than as a set of linked stores and fluxes, so quantitative reasoning about storage change, recharge and discharge is never practised.
What to do instead
For every water question, write the balance first (inputs − outputs = change in storage) and locate the water table. Distinguish porosity from permeability explicitly, and state which way water flows (high head to low head). Practise short calculations with recharge, abstraction and evapotranspiration figures so the balance is a habit, not an afterthought.
On natural-hazard questions, the candidate names the hazard and its damage but omits the causal mechanism and the risk components, e.g. describing a landslide without linking slope angle, lithology, water content and undercutting, or describing volcanic risk without separating hazard, exposure and vulnerability, and without any mitigation measure.
Hazard topics invite descriptive writing about disasters; candidates answer what happened rather than why, and the risk framework (hazard × exposure × vulnerability, plus mitigation) is not rehearsed as a structure.
What to do instead
Use a fixed skeleton for every hazard: triggering and predisposing factors → mechanism → affected elements (exposure/vulnerability) → mitigation and monitoring. For slope stability, always name the driving and resisting forces and how water alters both. For volcanoes, distinguish the specific hazards (lava, pyroclastic flows, ash, lahars) because each needs a different mitigation.
The candidate describes the Balearic Islands using generic Mediterranean or mainland Spanish geology: wrong lithologies for a named island, no mention of the Alpine compression that built the Serra de Tramuntana, no distinction between Mallorca's northern range and the central/levante zones, and no reference to the karstic and coastal systems that dominate the islands.
Regional geology is often studied last and from general summaries; candidates substitute a plausible mainland template (e.g. Iberian Meseta or Betic chain detail) for island-specific stratigraphy and structure, and cannot name formations or localities.
What to do instead
Build a one-page island-by-island sheet: dominant lithologies (Mesozoic carbonates, marls, evaporites such as the Mallorca keuper, volcanic rocks of the Columbretes-type minor outcrops where relevant), main structural units, and the karst and coastal features. Learn three named localities per island and rehearse explaining how island isolation, karst aquifers and coastal erosion create island-specific hazards.
In environmental impact and pollution answers, the candidate lists pollutants or impacts without the regulatory and management framework: no mention of environmental impact assessment stages (screening, scoping, baseline, prediction, mitigation, monitoring, public participation), no distinction between prevention, reduction and remediation, and no reference to waste hierarchy or protected-area categories.
The scientific content is over-rehearsed while the procedural and management content is skimmed, so answers read as chemistry or ecology essays that never address how impacts are assessed, regulated or mitigated.
What to do instead
Memorise the EIA sequence as an ordered list and apply it as the backbone of any impact question. Practise classifying measures as prevention, mitigation or compensation, and place waste-management options in hierarchy order (prevention, reuse, recycling, recovery, disposal). Learn the Spanish and Balearic protected-area categories and give one island example.
When answering soil or biosphere questions, the candidate conflates soil texture with structure, lists soil horizons without explaining the processes that form them, and describes biodiversity or ecosystem services as a list of slogans with no link to soil formation factors or degradation processes (erosion, salinisation, loss of organic matter).
Soil is treated as a vocabulary topic rather than a system with inputs, transformation and loss; the five soil-forming factors and the texture/structure distinction are not actively used, so answers stay descriptive and shallow.
What to do instead
For any soil question, start from the five factors (climate, organisms, relief, parent material, time) and then trace one profile horizon by horizon with the process named (eluviation, illuviation, humification). Explicitly separate texture (particle size) from structure (aggregation). Link degradation to a measurable process and a management response, and connect biodiversity to a named ecosystem service.
The candidate answers metamorphism and deformation questions with isolated terms: naming a metamorphic facies without linking it to pressure–temperature conditions and plate setting, or describing a fold or fault without stating the stress regime, the strain type (brittle vs ductile) and the depth at which it forms.
Metamorphic facies and structural terms are memorised as vocabulary lists, detached from the P–T–depth framework, so the candidate cannot connect a rock or structure to its tectonic environment and loses the reasoning marks.
What to do instead
Anchor each facies to a P–T field and a setting (e.g. blueschist to subduction, granulite to deep crustal/contact settings) and draw a simple P–T diagram from memory. For structures, always state stress regime, brittle or ductile behaviour, depth and resulting geometry. Rehearse by explaining one rock and one structure end-to-end through the tectonic setting.