📚 Core IGCSE Geography Concepts | 剑桥IGCSE地理核心知识点梳理
The Cambridge IGCSE Geography syllabus covers a wide range of human and physical geography topics. This article summarises the core concepts you need to master for Year 10, covering population, migration, settlements, tectonic processes, rivers, coasts, weather, climate, development and food production. Each section presents essential definitions and processes in both English and Chinese to support bilingual learning.
剑桥 IGCSE 地理教学大纲涵盖广泛的人文与自然地理主题。本文梳理了 Year 10 必须掌握的核心知识点，包括人口、迁移、定居点、构造过程、河流、海岸、天气、气候、发展及粮食生产。每一部分都用英汉双语呈现关键定义和过程，以支持双语学习。
1. Population Dynamics | 人口动态
Population change is driven by birth rate, death rate and migration. The birth rate is the number of live births per 1000 people per year, while the death rate is the number of deaths per 1000 people per year. Natural increase (or decrease) is the difference between the two.
人口变化由出生率、死亡率和迁移驱动。出生率是每千人年活产数，死亡率是每千人年死亡数。自然增长（或减少）是两者之差。
Natural increase = Birth rate − Death rate
Population pyramids (age‑sex graphs) reveal the structure of a population. An expansive pyramid with a wide base indicates high birth rates and a youthful population, typical of Stage 1 or 2 of the Demographic Transition Model (DTM). A constrictive pyramid with a narrow base suggests an ageing population and low birth rates, common in Stage 4 or 5.
人口金字塔（年龄‑性别图）揭示人口结构。底部宽阔的扩张型金字塔表明高出生率和年轻人口，常见于人口转变模型 (DTM) 第 1 或第 2 阶段。底部狭窄的收缩型金字塔则暗示老龄化人口和低出生率，常见于第 4 或第 5 阶段。
The Demographic Transition Model describes how birth and death rates change as a country develops. Stage 1 (high stationary): both rates are high and fluctuate due to famine, disease and war, so population growth is very slow. Stage 2 (early expanding): death rate falls rapidly because of improved healthcare and sanitation, while birth rate remains high, leading to rapid population increase. Stage 3 (late expanding): birth rate starts to decline as a result of urbanisation, better education and access to contraception. Stage 4 (low stationary): both birth and death rates are low, so the population remains stable or grows slowly. Stage 5 (decline): death rate slightly exceeds birth rate, resulting in natural decrease.
人口转变模型描述随着国家发展出生率和死亡率如何变化。阶段 1（高位静止）：两者都高，因饥荒、疾病和战争而波动，人口增长极慢。阶段 2（早期扩张）：因医疗和卫生改善，死亡率迅速下降，而出生率仍高，导致人口快速增长。阶段 3（晚期扩张）：城市化、教育改善和避孕手段普及使出生率开始下降。阶段 4（低位静止）：出生率和死亡率都低，人口稳定或缓慢增长。阶段 5（衰退）：死亡率略高于出生率，造成自然减少。
The dependency ratio compares the economically dependent (under 15 and over 65) to the working‑age population (15‑64). A high dependency ratio puts pressure on healthcare, education and social services.
抚养比是将经济依赖人口（15 岁以下和 65 岁以上）与劳动年龄人口（15‑64 岁）作比较。抚养比高会给医疗、教育和社会服务带来压力。
2. Migration | 人口迁移
Migration is the movement of people across a boundary with the intention of establishing a permanent or semi‑permanent residence. Push factors are negative aspects of the origin area that drive people away, while pull factors are positive attributes of the destination that attract migrants.
迁移是人口跨越边界并打算建立永久或半永久居住地的移动。推力因素是原居地驱使人离开的负面因素，拉力因素是目的地吸引移民的正面属性。
Common push factors include unemployment, poverty, war, natural disasters, and lack of services. Typical pull factors include better job opportunities, higher wages, political stability, good education and healthcare.
常见的推力因素包括失业、贫困、战争、自然灾害和缺乏服务。典型的拉力因素包括更好的就业机会、更高工资、政治稳定、良好教育和医疗。
Migration can be classified as internal (within a country) or international (across borders). It can be voluntary or forced (e.g. refugees fleeing conflict). Rural‑to‑urban migration is the dominant flow in many developing countries, driven by industrialisation and perceived city opportunities.
迁移可分为国内迁移（一国内部）或国际迁移（跨越国境）。可以是自愿的或被迫的（如逃离冲突的难民）。在工业化推动和对城市机会的认知下，农村向城市迁移是许多发展中国家的主要流向。
Impacts on the destination area include a larger labour force and cultural diversity, but also pressure on housing, transport and services. Impacts on the source area include loss of young workers but also reduced pressure on land and resources, plus remittances sent home.
对目的地的影响包括劳动力增加和文化多样性，但也给住房、交通和服务带来压力。对来源地的影响包括青年劳动力流失，但也减轻了土地和资源压力，此外还有汇款寄回当地。
3. Settlement Patterns | 定居点模式
Settlement site refers to the actual land on which a settlement is built, while situation describes the settlement’s location in relation to its surrounding features, such as rivers, trade routes or defensive positions. Wet point sites, dry point sites and bridging points are common historical site factors.
定居点地址指建成区的实际用地，而相对位置描述定居点与其周围特征（如河流、贸易路线或防御位置）的关系。湿地、干地和渡口是常见的历史选址因素。
Settlement hierarchy ranks settlements by size, population and the services they provide. From small to large these are: isolated dwelling, hamlet, village, town, city and metropolis. The higher the order, the fewer the settlements and the greater the range of services. Threshold population is the minimum number of people needed to support a service.
定居点等级体系按规模、人口和提供的服务对定居点进行排序。从小型到大型依次为：独立住宅、小村落、村庄、镇、城市和都市。等级越高，定居点数量越少，服务范围越大。门槛人口是维持一种服务所需的最低人口数量。
Urban land use models include the Burgess concentric zone model and the Hoyt sector model. The Burgess model shows rings of land use radiating out from the Central Business District (CBD), with industry and workers’ housing near the centre and higher‑class residential farther out. The Hoyt model modifies this with sectors developed along transport routes.
城市土地利用模型包括伯吉斯同心圆模型和霍伊特扇形模型。伯吉斯模型显示从中央商务区向外辐射的同心环，工业和工人住房靠近中心，较高阶层住宅位于外围。霍伊特模型则以沿交通线发展的扇形区加以修正。
Urbanisation is the increase in the proportion of people living in towns and cities, driven by rural‑to‑urban migration and natural increase. Problems in rapidly urbanising areas include congestion, slums, informal housing, pollution and inadequate infrastructure. Sustainable city solutions involve green belts, integrated public transport, waste recycling and mixed‑use developments.
城市化是城镇人口比例提高的过程，由农村向城市迁移和自然增长推动。快速城市化地区的问题包括交通拥堵、贫民窟、非正规住房、污染和基础设施不足。可持续城市解决方案涉及绿化带、综合公共交通、废物回收和混合用途开发。
4. Plate Tectonics | 板块构造
The Earth’s structure consists of the inner core, outer core, mantle and crust. The crust and upper mantle form the lithosphere, which is broken into tectonic plates that float on the semi‑molten asthenosphere. Heat from radioactive decay in the core creates convection currents in the mantle, driving plate movement.
地球的构造包括内核、外核、地幔和地壳。地壳和上地幔构成岩石圈，被分裂成漂浮在半熔的软流层上的构造板块。地核中放射性衰变产生的热量在地幔中形成对流，驱动板块运动。
At a constructive (divergent) plate boundary, plates move apart and new crust is formed from rising magma, e.g. the Mid‑Atlantic Ridge. This creates gentle volcanic eruptions and shallow earthquakes. At a destructive (convergent) boundary, an oceanic plate subducts beneath a continental plate, forming deep ocean trenches, explosive volcanoes and fold mountains, e.g. the Andes. Collision boundaries build fold mountains when two continental plates meet, e.g. the Himalayas.
在建设性（背离）板块边界，板块彼此分离，上升的岩浆形成新的地壳，如大西洋中脊。这产生温和的火山喷发和浅源地震。在破坏性（汇聚）边界，大洋板块俯冲到大陆板块之下，形成深海沟、爆发性火山和褶皱山脉，如安第斯山脉。碰撞边界在两个大陆板块相遇时形成褶皱山脉，如喜马拉雅山。
At a conservative (transform) boundary, plates slide past each other; crust is neither created nor destroyed. Friction builds and is released as severe earthquakes, e.g. the San Andreas Fault.
在保守（转换）边界，板块彼此滑过，地壳既不生成也不消亡。摩擦积聚并以剧烈地震形式释放，如圣安德烈亚斯断层。
Volcanoes occur at constructive and destructive boundaries, as well as at hotspots. Shield volcanoes have gentle slopes and runny lava; composite volcanoes have steep sides and explosive eruptions. Earthquakes emit seismic waves (P, S and surface waves). The focus is the point of rupture underground; the epicentre is the point on the surface directly above. Richter scale measures magnitude; Mercalli scale measures intensity.
火山出现在建设性和破坏性边界，以及热点处。盾状火山坡度平缓，熔岩稀薄；复合火山侧坡陡峭，喷发剧烈。地震释放地震波（P 波、S 波和面波）。震源是地下破裂点；震中是地表正上方的点。里氏震级测量规模；麦卡利烈度表测量强度。
5. Rivers | 河流地貌
A drainage basin is the area of land drained by a river and its tributaries. The boundary is called the watershed. The long profile of a river shows gradient changes from source to mouth; the cross‑profile changes from V‑shaped valleys in the upper course to wide, flat floodplains in the lower course.
流域是河流及其支流排水的陆地区域。边界称为分水岭。河流的纵剖面显示从源头到河口的梯度变化；横剖面从上游的 V 形河谷变为下游宽阔平坦的洪泛平原。
Fluvial processes include erosion (hydraulic action, abrasion, attrition, solution), transportation (traction, saltation, suspension, solution) and deposition. Vertical erosion dominates the upper course, creating steep valleys; lateral erosion and deposition shape meanders and floodplains in the middle and lower courses.
河流作用包括侵蚀（水力作用、磨蚀、磨损、溶蚀）、搬运（推移、跃移、悬移、溶运）和沉积。上游以下切侵蚀为主，形成陡峭河谷；中下游以侧蚀和沉积塑造曲流和洪泛平原。
Key landforms: waterfalls and gorges form where a band of hard rock overlies a softer rock, undercutting creates a plunge pool and collapse. Meanders are bends in the river; erosion on the outer bank and deposition on the inner bank create point bars. When a meander is cut off, an oxbow lake forms. Floodplains and levees develop through repeated flooding events, depositing alluvium. Deltas form at the river mouth where sediment is deposited faster than it is removed by tides or currents.
主要地貌：瀑布和峡谷形成于硬岩层覆盖在软岩之上的位置，掏蚀形成壶穴和崩塌。曲流是河流的弯曲段；凹岸侵蚀、凸岸沉积形成点坝。曲流被截断时形成牛轭湖。洪泛平原和天然堤通过反复的洪水事件沉积冲积物而形成。三角洲形成于河口，在这里沉积物堆积速度超过潮汐或水流搬运速度。
Causes of flooding include heavy rainfall, snowmelt, deforestation and urbanisation reducing infiltration. Hard engineering strategies (dams, levees, channel straightening) and soft engineering (afforestation, floodplain zoning, restoration of wetlands) can reduce flood risk.
洪水成因包括暴雨、融雪、森林砍伐和城市化减少下渗。硬工程策略（大坝、堤防、河道裁直）和软工程（造林、洪泛区划分区、恢复湿地）可以减少洪水风险。
6. Coastal Processes | 海岸过程
Waves are the primary force shaping coastlines. Constructive waves have a strong swash and weak backwash, depositing material to build up beaches. Destructive waves have a weak swash and strong backwash, eroding the coast. Waves erode through hydraulic action, abrasion, attrition and solution. Sub‑aerial processes like weathering and mass movement also weaken cliffs.
波浪是塑造海岸线的主要力量。建设性波浪上冲强、回流弱，沉积物质以建造海滩。破坏性波浪上冲弱、回流强，侵蚀海岸。波浪通过水力作用、磨蚀、磨损和溶蚀进行侵蚀。风化及块体运动等陆上过程也会削弱悬崖。
Coastal erosion landforms: cliffs and wave‑cut platforms develop when waves undercut the base, causing collapse. Caves, arches, stacks and stumps form on headlands where weaker rock is eroded, opening a cave that becomes an arch and collapses into a stack, which further erodes into a stump.
海岸侵蚀地貌：悬崖和海蚀平台形成于波浪掏蚀底部导致崩塌时。海蚀洞、海蚀拱、海蚀柱和海蚀残柱形成在岬角的软弱岩石被侵蚀成洞，洞扩展成拱，拱顶坍塌留下海蚀柱，进一步侵蚀为残柱。
Coastal deposition landforms: beaches are accumulations of sand or shingle. Spits are ridges of sand or shingle extending from the coast, often with a hooked end. A tombolo is a spit that connects an island to the mainland. Salt marshes and sand dunes also develop in sheltered areas.
海岸沉积地貌：海滩是沙或卵石的积聚。沙嘴是从海岸延伸出的沙或卵石脊，常带有钩状末端。连岛沙洲是将岛屿与大陆连接的沙嘴。盐沼和沙丘也在遮蔽区域发育。
Coastal management: hard engineering includes sea walls, groynes, rock armour and revetments. Soft engineering includes beach nourishment, dune stabilisation and managed retreat. There is often tension between protecting property and allowing natural processes.
海岸管理：硬工程包括海堤、丁坝、护面块体和护岸。软工程包括海滩补沙、沙丘固化和有规划的后退。在保护财产与容许自然过程之间常常存在矛盾。
7. Weather and Climate | 天气与气候
Weather is the day‑to‑day state of the atmosphere, while climate is the average weather conditions over 30 years or more. Key elements of weather include temperature, precipitation, wind speed and direction, humidity, cloud cover and atmospheric pressure.
天气是大气每日的状态，而气候是 30 年或更长时间内的平均天气状况。天气的关键要素包括温度、降水、风速风向、湿度、云量和气压。
Weather instruments: a Stevenson screen houses thermometers (max‑min), a hygrometer and a thermometer to ensure accurate readings. A rain gauge measures precipitation in mm. A barometer measures air pressure. An anemometer measures wind speed; a wind vane shows direction. A sunshine recorder measures hours of bright sunshine.
气象仪器：百叶箱内装有温度计（最高‑最低）、湿度计和温度计以确保准确读数。雨量器测量降水，单位为毫米。气压计测量气压。风速计测量风速；风向标指示风向。日照计测量日照时数。
Factors affecting climate include latitude (insolation), altitude (temperature drops with height), distance from the sea (continentality), ocean currents, prevailing winds, and aspect (slope direction). A climate graph combines monthly temperature (line) and precipitation (bars).
影响气候的因素包括纬度（日照）、海拔（温度随高度降低）、距海远近（大陆度）、洋流、盛行风和坡向。气候图将月均温（折线）和月降水量（柱状）结合展示。
Major climate zones: equatorial (hot, wet all year), tropical savanna (hot, wet and dry seasons), hot desert (arid, large diurnal range), Mediterranean (mild wet winters, hot dry summers), temperate maritime (mild, rain all year), and polar. Each has characteristic natural vegetation adapted to the climate.
主要气候带：赤道气候（全年炎热多雨）、热带稀树草原气候（干湿季分明）、热荒漠气候（干旱，昼夜温差大）、地中海气候（温和多雨冬季，炎热干燥夏季）、温带海洋性气候（温和，全年有雨）和极地气候。每种都有适应该气候的独特自然植被。
8. Ecosystems | 生态系统
An ecosystem is a community of living organisms (biotic) interacting with their non‑living (abiotic) environment. Energy flows through food chains, and nutrients are recycled via decomposers. Biomes are large‑scale ecosystems, such as tropical rainforests, deserts, grasslands and tundra, distributed according to climate.
生态系统是生物（生物成分）与它们非生物环境相互作用的群落。能量通过食物链流动，养分由分解者循环。生物群系是大尺度的生态系统，如热带雨林、沙漠、草原和苔原，其分布与气候相关。
Tropical rainforests are found near the equator with high temperatures (approx. 28°C) and over 2000 mm rainfall annually. The vegetation structure includes emergents, canopy, understory and forest floor. Adaptations include buttress roots for support, drip tips to shed water and shallow roots to absorb nutrients from the thin topsoil. The nutrient cycle is rapid with most nutrients stored in the biomass, not the soil.
热带雨林分布在赤道附近，年均温约 28°C，年降雨量超过 2000 mm。植被结构包括露生层、树冠层、林下层和地面层。适应特征包括起支撑作用的板根、滴水叶尖和适应浅层表土取养分的浅根系。养分循环快速，绝大部分养分储存在生物量中而非土壤。
Deforestation caused by logging, cattle ranching, plantation agriculture and mining leads to habitat loss, reduced biodiversity, soil erosion, disruption of the water cycle and increased CO₂ emissions. Sustainable management includes selective logging, reforestation, ecotourism and protected areas.
伐木、养牛业、种植园农业和采矿造成的森林砍伐导致栖息地丧失、生物多样性减少、土壤侵蚀、水循环扰动和二氧化碳排放增加。可持续管理包括选择性砍伐、重新造林、生态旅游和保护区。
9. Development | 发展
Development refers to the economic, social and political progress of a country. It can be measured by economic indicators like GDP per capita, or social indicators such as literacy rate, life expectancy and access to clean water. The Human Development Index (HDI) combines life expectancy, education and income into a single score from 0 to 1.
发展指一个国家的经济、社会和政治进步。可用经济指标（如人均 GDP）或社会指标（如识字率、预期寿命和清洁用水获取率）来衡量。人类发展指数 (HDI) 将预期寿命、教育和收入合成一个 0 至 1 的分数。
Causes of uneven development include historical factors (colonialism), physical geography (landlocked countries, climate extremes), political instability and unfair trade. The North‑South divide broadly separates richer developed countries (Global North) from poorer developing countries (Global South).
发展不均衡的原因包括历史因素（殖民主义）、自然地理（内陆国、极端气候）、政治不稳定和不公平的贸易。南北差距大致把较富裕的发达国家（全球北方）与较贫穷的发展中国家（全球南方）分开。
Strategies to reduce the development gap include international aid (bilateral, multilateral), fair trade schemes that guarantee higher prices for producers, debt relief, foreign direct investment (FDI) and sustainable tourism. However, aid can create dependency and may not reach the most needy.
缩小发展差距的策略包括国际援助（双边、多边）、保证生产者更高价格的公平贸易计划、债务减免、外商直接投资和可持续旅游。但援助可能造成依赖，且未必惠及最需要的人群。
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