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100+ Free La Rioja PAU Geology and Environmental Sciences Practice Questions
La Rioja PAU Geology and Environmental Sciences Examination (Geología y Ciencias Ambientales 2º Bachillerato Universidad de La Rioja 2026) practice questions are available now; exam metadata is being verified.
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Sample La Rioja PAU Geology and Environmental Sciences Practice Questions
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1Which type of seismic body wave cannot propagate through liquid media, providing key evidence that Earth's outer core is liquid?
A.P-waves (Primary waves)
B.S-waves (Secondary waves)
C.Rayleigh waves
D.Love waves
Explanation: Secondary (S) waves are transverse shear waves that require shear strength to propagate and cannot travel through liquids. Their disappearance beyond 105 degrees from an earthquake epicenter creates an S-wave shadow zone, proving that Earth's outer core is liquid.
2What seismic discontinuity marks the boundary between Earth's crust and the upper mantle?
A.Gutenberg discontinuity
B.Lehmann discontinuity
C.Mohorovičić discontinuity
D.Conrad discontinuity
Explanation: The Mohorovičić discontinuity (Moho) is the boundary separating Earth's crust from the underlying mantle, marked by a sharp increase in seismic P-wave velocity from about 6–7 km/s to 8 km/s.
3Why does the asthenosphere act as a low-velocity zone (LVZ) for seismic waves?
A.It consists of completely molten, liquid nickel-iron alloy.
B.It contains 1–5% partial melt of peridotite, reducing rigidity.
C.It is composed of low-density gaseous inclusions trapped under high pressure.
D.It is made of rigid, cold subducted lithospheric slabs.
Explanation: The asthenosphere experiences a drop in seismic wave velocities because temperature approaches the mantle solidus, causing partial melting (1–5%) of peridotite. This reduces the shear modulus and enables ductile flow of mantle rock.
4What geodynamic mechanism explains the age-progressive volcanic island chains like Hawaii and the Canary Islands?
A.Subduction slab rollback at oceanic trenches
B.Mantle plume hotspots originating from the core-mantle boundary
C.Transform fault fracturing of oceanic crust
D.Continental collision suture zone magmatism
Explanation: Mantle plume hotspots are buoyant, thermal upwellings originating deep in the mantle (D'' layer at the core-mantle boundary). As an oceanic tectonic plate moves over a stationary hotspot, a linear, age-progressive chain of volcanic islands is formed.
5How do magnetic anomaly stripes symmetrical to mid-ocean ridge axes support seafloor spreading?
A.They record geomagnetic field reversals preserved in basalt cooling below the Curie temperature.
B.They measure seasonal variations in ocean water temperature during lava extrusion.
C.They trace gravitational anomalies caused by subducting oceanic trenches.
D.They reflect solar radiation cycles recorded in deep marine sediments.
Explanation: Basaltic magma extruded at mid-ocean ridges cools below the Curie temperature (~580°C for magnetite), locking in the orientation of Earth's magnetic field. Symmetrical stripes of normal and reversed polarity record continuous seafloor generation over time.
6What type of plate boundary is the San Andreas Fault in California?
A.Divergent boundary
B.Convergent subduction boundary
C.Transform boundary
D.Continental collision boundary
Explanation: The San Andreas Fault is a transform plate boundary where the Pacific Plate and North American Plate slide horizontally past each other along a right-lateral strike-slip fault zone.
7What is the Wadati-Benioff zone in subduction zones?
A.A shallow seismic gap located directly beneath mid-ocean ridge rifts
B.A planar zone of dipping hypocenters extending down into the mantle along a subducting plate
C.An horizontal ductile shear zone within continental crust
D.A high-temperature thermal aureole surrounding magma chambers
Explanation: The Wadati-Benioff zone is a dipping planar belt of earthquake foci (hypocenters) ranging from shallow to deep (up to ~700 km) that outlines the descending cold, rigid lithospheric slab plunging into the mantle at subduction zones.
8Which mountain belt formed as a result of the continental collision between the Indian and Eurasian plates?
A.The Andes Mountain Range
B.The Himalayan Mountain Range
C.The Cascade Volcanic Arc
D.The Mid-Atlantic Ridge
Explanation: The Himalayan Mountain Range formed during the Cenozoic era when the Indian landmass collided continent-to-continent with the Eurasian Plate, resulting in intense crustal thickening, folding, and thrust faulting without active subduction volcanism.
9According to the Airy model of isostasy, how do high mountain ranges maintain gravitational equilibrium?
A.They have uniform crustal thickness but varying lateral rock densities.
B.They possess deep crustal roots of low-density material projecting down into the mantle.
C.They are supported by high internal gas pressure within crustal magma chambers.
D.They float on a completely liquid asthenospheric ocean of pure magma.
Explanation: The Airy model of isostasy posits that Earth's crust has a constant density but varying thickness; taller mountain ranges are buoyantly supported by deeper crustal roots extending into the higher-density mantle, analogous to icebergs floating in water.
10What type of stress regime and fault displacement causes normal faults?
A.Compressional stress where the hanging wall moves up relative to the footwall
B.Tensional stress where the hanging wall moves down relative to the footwall
C.Shear stress where blocks slide horizontally past each other
D.Torsional stress where rock columns twist around a vertical axis
Explanation: Normal faults develop under tensional stress regimes (crustal extension), causing the hanging wall block to move downward relative to the footwall block along a dipping fault plane.
About the La Rioja PAU Geology and Environmental Sciences Practice Questions
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