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OCR A Level GeologyH414/02 Scientific literacy in geology MERGED QUESTION PAPER AND MARK SCHEME FOR JUNE 2024 $10.49   Add to cart

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OCR A Level GeologyH414/02 Scientific literacy in geology MERGED QUESTION PAPER AND MARK SCHEME FOR JUNE 2024

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  • Course
  • Geology
  • Institution
  • Geology

OCR A Level GeologyH414/02 Scientific literacy in geology MERGED QUESTION PAPER AND MARK SCHEME FOR JUNE 2024

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  • November 8, 2024
  • 56
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Geology
  • Geology
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williesmaish2999
Wednesday 12 June 2024 – Afternoon
A Level Geology
H414/02 Scientific literacy in geology
Time allowed: 2 hours 15 minutes

, 2
1
(a)
(i) Draw a fully labelled diagram to show the processes of saltation and traction along a river bed.




[2]

(ii) Given a constant flow velocity, explain how particles of the same grain size can be transported by
saltation or suspension.

..........................................................................................................................................................

..................................................................................................................................................... [1]

(b) Describe the differences between sediments which are texturally mature and texturally immature.
Explain how sediments become texturally mature.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

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..................................................................................................................................................... [3]




© OCR 2024

, 3
(c) The Hjulström curve graph shows the relationship between the grain size of a sediment and the
flow velocity required for erosion, transportation and deposition.

1000



Erosion
100



Flow
velocity 10
(cm s–1)


Transport Deposition
1




0.1
0.001 0.01 0.1 1 10 100 1000
Grain size (mm)

(i) State the minimum flow velocity required to erode a grain size of 1 mm.

Minimum flow velocity = ...................... Unit = ...................... [1]


(ii) State the maximum grain size that would be deposited if the flow velocity slowed to 2 cm s–1.

Maximum grain size = ...................... Unit = ...................... [1]


(iii) Explain why both axes of the Hjulström curve graph use logarithmic scales.

..........................................................................................................................................................

..................................................................................................................................................... [1]




© OCR 2024 Turn over

, 4
(d) Diagenesis refers to the physical and chemical processes that change unconsolidated sediments
into sedimentary rock.

(i) Name and explain the physical processes that occur during diagenesis.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..................................................................................................................................................... [2]

The thin section diagram shows a sandstone.

Quartz
grains



A B



1 mm

(ii) During diagenesis, cement can form in a sedimentary rock by two separate chemical processes.

Name and explain the most likely diagenetic process that will occur at point A shown on the
diagram.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..................................................................................................................................................... [2]

(iii) Name and explain the most likely process by which cement will form at point B shown on the
diagram.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..................................................................................................................................................... [2]




© OCR 2024

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