📚 Year 12 OCR Geography Core Knowledge Review | Year 12 OCR 地理核心知识点梳理
Building a solid foundation in Year 12 OCR Geography means grasping the essential physical and human systems that shape our planet. This review distils the core knowledge from coastal landscapes and earth’s life support systems to changing places, migration and hazardous earth, providing a structured bilingual companion for effective revision.
打好 Year 12 OCR 地理的坚实基础，意味着要掌握塑造我们星球的关键自然与人文系统。本文梳理了从海岸地貌、地球生命支持系统到变化中的场所、移民及灾害地球的核心知识，为高效复习提供结构化的双语伴侣。
1. Coastal Processes: Erosion, Transport and Deposition | 海岸过程：侵蚀、搬运与沉积
Coastal environments are shaped by the interplay of erosion, transportation and deposition. The main erosional processes include hydraulic action, abrasion, attrition and solution, which continuously wear away cliffs and shore platforms.
海岸环境由侵蚀、搬运和沉积的相互作用塑造而成。主要的侵蚀过程包括水力作用、磨蚀、磨耗和溶蚀，它们不断磨损悬崖和岸坡。
Sediment is moved along the coast by longshore drift, where waves approaching at an angle move material up the beach in swash and carry it back down at right angles in backwash, creating a zigzag transport pattern.
沉积物通过沿岸漂移沿海岸移动，波浪以一定角度冲上沙滩形成冲流，再以直角回流将物质带回，形成之字形搬运模式。
Deposition builds landforms when wave energy falls; constructive waves with low energy and strong swash deposit sand and shingle, leading to the development of beaches, spits and bars.
当波浪能量减弱时发生沉积；低能量而冲流较强的建设性波浪堆积沙石，形成海滩、沙嘴和沙坝等堆积地貌。
2. Coastal Landforms: From Cliffs to Spits | 海岸地貌：从海蚀崖到沙嘴
Erosional landforms such as headlands, bays, wave‑cut platforms and stacks develop as rocks of varying resistance are attacked by waves. A headland erodes to form caves, arches and then stacks, leaving a wave‑cut platform at its base.
当海浪侵蚀抗力不同的岩石时，便形成海角、海湾、波蚀平台和海蚀柱等侵蚀地貌。海角被侵蚀形成海蚀洞、海蚀拱，进而坍塌为海蚀柱，其基部留下波蚀平台。
Depositional features grow where sediment accumulates. Spits are narrow ridges of sand or shingle attached to the land at one end and extending across an estuary, while bars can seal off a bay creating a lagoon.
堆积地貌在沉积物聚集处形成。沙嘴是窄长的沙脊或砾石脊，一端连接陆地并横越河口延伸，而沙坝则能封闭海湾形成潟湖。
Sand dunes develop through plant succession from embryo dunes to climax woodland. Salt marshes form in sheltered, low‑energy environments behind spits, where silt and mud accumulate and halophytic vegetation colonises.
沙丘通过从先锋沙丘到顶级群落的植物演替发育。盐沼在沙嘴后方遮蔽、低能的环境中形成，粉砂和淤泥堆积并被盐生植物定植。
3. The Global Water Cycle: Stores and Fluxes | 全球水循环：储存库与通量
The global water cycle is a closed system in which water moves between major stores: the oceans (97% of all water), ice caps, groundwater, lakes, soils, the atmosphere and biosphere. Fluxes such as evaporation, precipitation, runoff and infiltration link these stores.
全球水循环是一个封闭系统，水在各大储存库间移动：海洋（占所有水量的97%）、冰盖、地下水、湖泊、土壤、大气和生物圈。蒸发、降水、径流和下渗等通量连接着这些储存库。
The drainage basin is an open subsystem. Inputs are precipitation, outputs include evapotranspiration and river discharge, and stores exist as interception, surface water, soil moisture and groundwater. The water balance equation is:
P = Q + ET ± ΔS
流域是一个开放的子系统。输入为降水，输出包括蒸散发和河流径流，储存以截留、地表水、土壤水和地下水形式存在。水平衡方程为：降雨量 = 径流量 + 蒸散发量 ± 储存变化量。
Human activities, such as groundwater abstraction and deforestation, can dramatically alter local water cycles. Over‑abstraction lowers water tables and reduces baseflow, while urbanisation increases surface runoff and flood risk.
人类活动，如地下水抽取和毁林，可剧烈改变局地水循环。过度抽取会降低地下水位并减少基流，而城市化则增加地表径流和洪水风险。
4. The Carbon Cycle and Anthropogenic Impacts | 碳循环与人类活动影响
Carbon is stored in the lithosphere (fossil fuels, sedimentary rocks), hydrosphere, biosphere and atmosphere. The key natural fluxes are photosynthesis, respiration, decomposition, oceanic absorption and volcanic outgassing. Photosynthesis fixes CO₂ into organic matter:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
碳储存在岩石圈（化石燃料、沉积岩）、水圈、生物圈和大气中。主要的自然通量是光合作用、呼吸作用、分解作用、海洋吸收和火山排气。光合作用将CO₂固定为有机物：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。
Burning fossil fuels has disturbed this equilibrium by transferring geological carbon into the atmosphere, raising CO₂ concentrations from ~280 ppm before the industrial revolution to over 420 ppm today. Deforestation reduces the biosphere’s capacity to sequester carbon.
化石燃料燃烧将地质碳释放到大气中，打破了平衡，使CO₂浓度从工业革命前的约280 ppm上升到今天的超过420 ppm。毁林削弱了生物圈固碳的能力。
Oceanic carbon sequestration increases acidity through the formation of carbonic acid (CO₂ + H₂O ⇌ H₂CO₃), harming marine ecosystems. Mitigation strategies include carbon capture, afforestation and transitioning to renewable energy.
海洋碳汇通过形成碳酸（CO₂ + H₂O ⇌ H₂CO₃）增加了酸度，危害海洋生态系统。缓解策略包括碳捕集、植树造林和向可再生能源转型。
5. Place and Placelessness: Identity and Perception | 场所与失地性：认同与感知
A ‘place’ is a space endowed with meaning, shaped by lived experience, emotional attachment and social interactions. Geographers distinguish between the objective location and the subjective sense of place, which can vary dramatically between insiders and outsiders.
“场所”是被赋予意义、由生活经验、情感依附和社会互动塑造的空间。地理学家区分客观位置与主观的场所感，后者在内部者和外部者之间可能有巨大差异。
Placelessness describes environments that lack distinctive identity, often produced by globalisation and the homogenising influence of transnational corporations. Cloned high streets and standardised chain outlets create landscapes that could be anywhere.
失地性描述缺乏独特认同的环境，通常由全球化和跨国公司的同质化影响造成。千城一面的商业街和标准化连锁店景观让人感到在任何地方都一样。
Perception of place is mediated through representation in art, media, tourism campaigns and social media. These representations can reinforce dominant narratives or challenge stereotypes, influencing place‑making and regeneration policies.
对场所的感知通过艺术、媒体、旅游宣传和社交媒体等再现形式被调解。这些再现既可强化主流叙事，也可挑战刻板印象，从而影响场所营造和复兴政策。
6. Economic Restructuring and Rebranding Places | 经济重组与地方重塑
Deindustrialisation in advanced economies has left many inner‑city areas and former industrial regions with dereliction, unemployment and social deprivation. Economic restructuring towards service and quaternary sectors seeks to revive these places.
发达经济体的去工业化给许多内城区和前工业区留下了衰败、失业和社会剥夺。向服务业和第四产业的经济重组试图重振这些地区。
Rebranding involves re‑imaging a place through flagship projects, cultural quarters, sports‑led regeneration or digital marketing. For example, the rebranding of Manchester’s Salford Quays transformed former docklands into a media and creative hub.
地方重塑通过旗舰项目、文化区、体育带动式更新或数字营销重新塑造地方形象。例如，曼彻斯特索尔福德码头的重塑将昔日的船坞区转变为媒体和创意中心。
However, regeneration can lead to gentrification, displacing existing communities and creating inequalities. Evaluating success requires looking beyond economic metrics to include social wellbeing, environmental quality and cultural vibrancy.
然而，更新可能导致绅士化，使原有社区被排挤并带来不平等。评估成功不能只看经济指标，还需纳入社会福祉、环境质量和文化活力。
7. Patterns and Causes of International Migration | 国际移民的模式与成因
International migration flows are far from random; they reflect deep spatial inequalities in wealth, security and opportunity. Key corridors include South–South movement, South–North flows from developing to developed countries, and increasing intra‑regional migration within economic blocs.
国际移民流远非随机，它反映了财富、安全和机遇方面深刻的空间不平等。主要走廊包括南南流动、从发展中国家到发达国家的南北流动，以及经济集团内部不断增长的区域内移民。
Lee’s push–pull model categorises the negative factors driving people from origin areas (push) and the attractions of destinations (pull). Push factors include conflict, poverty, unemployment and environmental degradation; pull factors include higher wages, safety, family reunification and educational opportunities.
Lee的推拉模型将驱使人们离开原籍地的负面因素（推力）和目的地的吸引力（拉力）分类。推力因素包括冲突、贫困、失业和环境恶化；拉力因素包括更高的工资、安全、家庭团聚和教育机会。
Forced migration, including refugees and asylum‑seekers, has accelerated due to geopolitical tensions, civil wars and climate change. The majority of refugees are hosted in neighbouring low‑income countries, challenging the narrative that all migration targets the global North.
因地缘政治紧张、内战和气候变化，被迫移民（包括难民和寻求庇护者）加速增长。大多数难民被邻国低收国家收容，这挑战了“所有移民都瞄准全球北方”的说法。
8. Consequences of Migration on Host and Source Countries | 移民对迁入国与来源国的影响
Host countries often experience labour market complementarity: migrants fill low‑skilled sectors and high‑skilled gaps, contributing to economic growth and tax revenue. However, perceived strains on public services and housing can fuel social tension and xenophobic narratives.
迁入国常经历劳动力市场的互补性：移民填补低技能行业和高技能缺口，促进经济增长和税收。但民众对公共服务和住房压力的感知可能加剧社会紧张和仇外言论。
Source countries lose young, productive labour through emigration, a phenomenon known as brain drain. Conversely, remittances sent home by diaspora communities can exceed foreign aid and make up a significant share of GDP, acting as a financial lifeline.
来源国因青年人出国而流失生产力，即人才外流。相反，侨民寄回的汇款可能超过对外援助，并在GDP中占显著份额，成为金融生命线。
Cultural consequences are bidirectional: transnational communities create multicultural societies with hybrid identities, while preserving diasporic traditions. Migration policies increasingly balance security concerns with the recognition of migrants’ rights and integration programmes.
文化后果是双向的：跨国社区创造了具有混合认同的多元文化社会，同时保留了侨民传统。移民政策日益在安全关切与承认移民权利和融合方案之间寻求平衡。
9. Plate Tectonics and Volcanic Hazards | 板块构造与火山灾害
The Earth’s lithosphere is divided into tectonic plates that move on the asthenosphere due to convection currents. Divergent boundaries create new crust, convergent boundaries destroy it (subduction or collision), and conservative boundaries see plates slide past each other.
地球岩石圈被划分为在软流圈上受对流驱动而移动的板块。离散边界生成新地壳，汇聚边界摧毁地壳（俯冲或碰撞），而保守边界处板块彼此滑过。
Volcanic hazards arise primarily at convergent and divergent margins, as well as at hot spots. Hazards include lava flows, pyroclastic flows, tephra falls, lahars and toxic gas emissions. The explosiveness depends on magma viscosity, gas content and silica level.
火山灾害主要发生在汇聚和离散边缘以及热点地区。灾害包括熔岩流、火山碎屑流、火山灰降落、火山泥流和有毒气体排放。爆发性强弱取决于岩浆粘度、气体含量和硅含量。
Management uses monitoring (seismometers, tiltmeters, gas sampling), hazard mapping and zonation. The Park model illustrates the disaster response curve, showing pre‑event preparation, relief, rehabilitation and reconstruction phases.
灾害管理采用监测（地震仪、倾斜仪、气体采样）、灾害制图和分区。Park模型展示了灾害响应曲线，呈现事件前的准备、救援、恢复和重建阶段。
10. Seismic Hazards and Risk Management | 地震灾害与风险管理
Seismic hazards originate from the sudden release of elastic strain along faults, generating seismic waves. Primary (P) waves are compressional and fastest, secondary (S) waves shear the ground, and surface waves cause the greatest damage.
地震灾害源于断层上弹性应变得突然释放，产生地震波。纵波是压缩波且速度最快，横波剪切地面，而面波造成的破坏最大。
The magnitude is measured by the moment magnitude scale (Mₓ), while the Modified Mercalli Intensity scale describes the felt effects. Deeper‑focus earthquakes may produce less surface shaking, but long‑duration shaking on unconsolidated sediments can trigger liquefaction.
震级用矩震级（Mₓ）测量，而修正的麦加利烈度表描述感觉影响。深源地震可能产生较小的地表震动，但在未固结沉积物上的长时震动可触发液化。
Risk is a product of hazard, exposure and vulnerability. Mitigation can include land‑use planning, seismic‑resistant building design (base isolation, cross‑bracing), early warning systems and community preparedness. The ‘Drop, Cover, Hold’ protective action is promoted in earthquake‑prone regions.
风险是灾害、暴露度和脆弱性的乘积。减灾可包括土地利用规划、抗震建筑设计（基础隔震、交叉支撑）、预警系统和社区备灾。在地震多发地区推广“伏地、遮挡、抓牢”的防护动作。
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