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Key Facts: Castilla y León PAU Geology and Environmental Sciences Exam

90 min

Exam Duration

Junta de Castilla y León

0–10

Grading Scale

USAL / UVA / UBU / ULE

4.0 / 10

Minimum Access Phase Score

Comisión Organizadora PAU CyL

EUR 76.82

Base Registration Fee

Junta de Castilla y León 2026

The Castilla y León PAU Geology and Environmental Sciences exam tests 2nd Bachillerato students in a 90-minute written examination in Spanish. Grades are on a 0–10 scale, with a minimum 4.0 required in the mandatory Access Phase to calculate the university admission mark (60% Bachillerato average + 40% PAU mark). Base registration costs EUR 76.82 in Castilla y León. Note: Our interactive practice question bank is an English-language MCQ study adaptation of the 2026 official curriculum.

Sample Castilla y León PAU Geology and Environmental Sciences Practice Questions

Try these sample questions to review concepts for the Castilla y León PAU Geology and Environmental Sciences exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which type of seismic body wave is compressional (longitudinal), travels fastest through the Earth, and can propagate through both solid and liquid layers?

A.P waves (Primary waves)

B.S waves (Secondary waves)

C.Love waves

D.Rayleigh waves

Explanation: Primary (P) waves are compressional longitudinal waves that travel fastest through Earth's interior and can pass through both solids and liquids because fluids resist compression. Secondary (S) waves are shear waves that cannot travel through liquids, while Love and Rayleigh waves are surface waves.

2Which seismic discontinuity marks the boundary between Earth's crust and the uppermost mantle?

A.Gutenberg discontinuity

B.Mohorovičić (Moho) discontinuity

C.Lehmann discontinuity

D.Repetti discontinuity

Explanation: The Mohorovičić (Moho) discontinuity marks the boundary between the crust and mantle, characterized by a sharp increase in seismic wave velocity due to the change from mafic/felsic crustal rocks to ultramafic mantle peridotite. The Gutenberg discontinuity separates the mantle from the liquid outer core, and the Lehmann discontinuity separates the liquid outer core from the solid inner core.

3What key mechanical property distinguishes the lithosphere from the underlying asthenosphere?

A.The lithosphere is rigid and brittle, whereas the asthenosphere is ductile and capable of slow plastic flow.

B.The lithosphere is entirely liquid metal, whereas the asthenosphere consists of solid mantle silicates.

C.The lithosphere undergoes high-grade metamorphism, whereas the asthenosphere has no pressure or temperature gradients.

D.The lithosphere lacks tectonic plates, whereas the asthenosphere is divided into rigid moving tectonic plates.

Explanation: The lithosphere encompasses the crust and uppermost mantle, behaving as a rigid, brittle solid that breaks into tectonic plates. The asthenosphere lies below in the upper mantle, where higher temperatures permit plastic, ductile flow under stress.

4At mid-ocean ridges, what geological process accounts for the formation of new oceanic lithosphere?

A.Subduction of continental crust into the lower mantle

B.Decompressional melting of ascending mantle peridotite generating basaltic magma

C.High-pressure contact metamorphism of deep-sea sediments

D.Tectonic collision creating thick continental roots

Explanation: As tectonic plates diverge at mid-ocean ridges, asthenospheric peridotite rises into areas of lower pressure. This decompressional melting generates basaltic magma that erupts or cools intrusively to form new oceanic crust.

5In an oceanic-continental subduction zone, why does the oceanic plate subduct beneath the continental plate?

A.Oceanic lithosphere is denser and thinner than continental lithosphere.

B.Oceanic lithosphere is less dense and thicker than continental lithosphere.

C.Continental lithosphere contains higher proportions of iron and magnesium silicates.

D.Oceanic lithosphere is preserved from subduction by high geothermal gradients.

Explanation: Oceanic lithosphere is composed of dense mafic rock (basalt and gabbro) and cools as it ages, making it denser than the buoyant, felsic (granitic) continental lithosphere. Consequently, the denser oceanic plate sinks into the asthenosphere.

6Which tectonic feature is produced where two lithospheric plates slide horizontally past one another without creating or destroying lithosphere?

A.Deep ocean trench

B.Transform fault

C.Volcanic island arc

D.Continental rift valley

Explanation: Transform plate boundaries (or conservative margins) involve strike-slip fault movement where plates slide horizontally past each other. Lithosphere is neither created nor consumed along transform faults.

7Which mechanism is currently considered the dominant gravitational force driving plate motion in subduction zones?

A.Basal traction from asthenospheric drag

B.Slab pull generated by the negative buoyancy of cold, dense subducting slabs

C.Ridge push resulting from gravitational sliding at transform offsets

D.Tidal forces exerted by the Moon and Sun

Explanation: Slab pull is the primary driving force of plate tectonics. As old oceanic lithosphere cools, it becomes denser than the underlying asthenosphere and metamorphoses into dense eclogite upon subduction, exerting a strong gravitational pull that drags the rest of the plate downward.

8Why does addition of water (flux melting) cause magma generation in subduction zones?

A.Water increases the melting temperature of mantle silicates.

B.Water lowers the solidus temperature of mantle peridotite.

C.Water reacts with iron to produce exothermic nuclear reactions.

D.Water converts felsic granite into dense ultrabasic cumulates.

Explanation: Dehydration of subducting oceanic crust releases hydrous fluids (water and volatiles) into the overlying mantle wedge. These fluids act as fluxing agents, lowering the solidus melting temperature of mantle peridotite and triggering partial melting.

9Which combination of magma characteristics promotes highly explosive volcanic eruptions?

A.Low silica content, low viscosity, and low dissolved gas content

B.High silica content, high viscosity, and high dissolved gas content

C.High iron-magnesium content, high temperature, and low gas content

D.Low silica content, high temperature, and high fluid flow

Explanation: Felsic/rhyolitic magmas have high silica content (SiO2 > 65%), making them highly viscous. High viscosity prevents dissolved gases (H2O, CO2) from escaping easily; gas pressure builds up until violent, explosive pyroclastic eruptions occur.

10What is a batholith?

A.A small tabular discordant pluton that cuts across bedding planes

B.A massive discordant intrusive igneous body with an exposed surface area exceeding 100 square kilometers

C.A concordant lens-shaped intrusion that arches the overlying strata upward

D.A tabular concordant igneous intrusion injected parallel to sedimentary rock layers

Explanation: A batholith is the largest type of pluton, defined as a discordant intrusive igneous body with an surface exposure greater than 100 km2, typically composed of granitic or granodioritic rocks formed in continental arc roots.

About the Castilla y León PAU Geology and Environmental Sciences Exam

The Castilla y León PAU (Prueba de Acceso a la Universidad) Geology and Environmental Sciences exam (Geología y Ciencias Ambientales) is the official university entrance assessment administered across Castilla y León by public universities (USAL, UVA, UBU, ULE) for 2nd Bachillerato students. Please note: The official PAU exam is a written 90-minute examination administered in Spanish. The practice questions in this local question bank represent an English-language multiple-choice question (MCQ) study adaptation specifically designed to help English-speaking students and international candidates master the 2026 curriculum concepts (plate tectonics, external geodynamics, biosphere dynamics, natural resources, environmental pollution, hazards, and sustainability).

Exam sponsor: Comisión Organizadora de las Pruebas de Acceso a la Universidad de Castilla y León (USAL, UVA, UBU, ULE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

90 minutes (1.5 hours)

Passing Score

Marked on a 0–10 scale. Minimum 4.0 required in Access Phase to combine with Bachillerato GPA (60% Bachillerato + 40% PAU >= 5.0 to pass).

Exam / Certification Fees

EUR 76.82 base registration fee for PAU Access Phase (plus EUR 10.33 per voluntary subject) set by Junta de Castilla y León.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

20%

Plate Tectonics & Internal Geodynamics

Lithospheric plate boundaries, seismic wave propagation, mantle convection dynamics, magmatism, metamorphism, structural geology, and regional tectonic context of the Iberian Peninsula.

20%

External Geodynamics & Geomorphological Landscapes

Mechanical and chemical weathering, river dynamics, karstic systems (e.g. Duero basin and Cantabrian range), glacial landforms, aeolian transport, and soil genesis.

20%

Earth System Dynamics & Biosphere

Biogeochemical cycling (carbon, nitrogen, phosphorus, hydrological cycle), energy transfer through ecosystems, ecological succession, and biodiversity preservation strategies.

20%

Natural Resources & Sustainable Energy Management

Hydrogeology and aquifer exploitation, mineral ore deposits, conventional fossil fuel reserves, nuclear power, renewable energy technologies, and circular economy.

20%

Environmental Pollution, Natural Hazards & Risk Assessment

Atmospheric pollutants, photochemical smog, global warming, water contamination, soil degradation, natural hazard quantification (Hazard x Exposure x Vulnerability), and EIA.

Preparing for the Castilla y León PAU Geology and Environmental Sciences Exam

What You Need to Know

Passing score: Marked on a 0–10 scale. Minimum 4.0 required in Access Phase to combine with Bachillerato GPA (60% Bachillerato + 40% PAU >= 5.0 to pass).
Assessment: Question count not published by the exam provider
Time limit: 90 minutes (1.5 hours)
Exam / certification fees: EUR 76.82 base registration fee for PAU Access Phase (plus EUR 10.33 per voluntary subject) set by Junta de Castilla y León. Official sources

Using Our Practice Resources

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Castilla y León PAU Geology and Environmental Sciences: Suggested Study Strategy

1Master the risk assessment formula: Risk = Hazard x Vulnerability x Exposure, and apply it to mass wasting, flood, and seismic scenarios.

2Understand regional geological features of Castilla y León, including the Duero Cenozoic basin, Cantabrian/Iberian mountain ranges, and local karst hydrogeology.

3Practice interpreting seismic wave shadow zones, geological cross-sections, and stratigraphical column diagrams.

4Review the mechanisms of anthropogenic environmental impacts, such as eutrophication, acid rain, stratospheric ozone depletion, and the enhanced greenhouse effect.

5Distinguish between primary and secondary pollutants, point and non-point source contamination, and renewable versus non-renewable energy resources.

Frequently Asked Questions

What is the format of the official Castilla y León PAU Geology and Environmental Sciences exam?

The official exam set by the Comisión Organizadora de Castilla y León is a 90-minute written examination in Spanish featuring structured open-response questions, geological map and cross-section analysis, and environmental problem-solving. The questions in this practice portal are an English-language MCQ study adaptation for self-assessment and core concept mastery.

How is the university entrance mark calculated in Castilla y León?

The PAU mark is scored on a 0–10 scale. In the mandatory Access Phase, a minimum score of 4.0 is required to combine with the 2nd Bachillerato GPA (weighted 60% Bachillerato + 40% PAU, requiring >= 5.0 to pass). Students can score up to 14 points by taking modal subjects in the voluntary Admission Phase.

Are the practice questions provided in English?

Yes. While the official PAU examination in Castilla y León is written in Spanish, this practice question bank is an English-language multiple-choice study adaptation designed to assist bilingual candidates, international students, and learners mastering key concepts.

Which universities manage the PAU exam in Castilla y León?

The exam is coordinated jointly by the public universities of Castilla y León: Universidad de Salamanca (USAL), Universidad de Valladolid (UVA), Universidad de Burgos (UBU), and Universidad de León (ULE), under the regional authority of the Junta de Castilla y León.

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