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Summary Hazardous Earth-Complete A* Case Study & Theory Notes (OCR A-Level)

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2024/2025 Written for academic year
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OCR
Course
Case Studies
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These A* Hazardous Earth notes cover every OCR A-Level Geography specification point in full, combining detailed theory, crystal-clear definitions and complete case studies for both volcanoes and earthquakes. Each concept is broken down with precise, examiner-style explanations and high-level geographical detail, giving you everything you need to write confident, top-band answers across the entire topic.

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Hazardous
Earth

, Oceanic crust : 5-10 km thick
,
basaltic
,
dense 3glam
Continental cust : 30-70 km thich
, granitic ,
less dense 2
Tglan
.




Tectonic theory
:



1 .
Weghner-Pangea , fossil +
geological fit accross continents
.
2 Hess sea floor mid
spreading + ocean
ridges
-




.
3 Paleomagnetism - Reversed magnetic strips -
Show Oceanic crust
formation




Plate Boundaries

constructive -


plates more apart
to
magna + fill gap
-




Basaltic low lava Shield volcanoes
viscocity
-
>
-
,

-


Shallow earthquakes ↳ effusive


Destructive :


·
Oceanic-continental

denser plate subducts under continental
-



oceanic

·
Oceanic -
oceanic
-
older
plate Subducts
Continental
· -
Continental
-


plates crumple to form mountains
=


Explosive volcanoes
(andesitic/rhyolitic
Conservative -


plates slide past
no volcanoes
generation
>
no
magna
- -




-


high friction >
-
shallow+ powerful earthquakes
↳ stress release

Document information

Study Level
A/AS Level
Subject
Geography
Uploaded on
November 21, 2025
Number of pages
10
Written in
2024/2025
Type
Summary
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