📚 Part 1 Physical Geography | 自然地理第一部分
Physical geography studies the natural systems and processes that shape Earth’s surface and atmosphere. For Edexcel A-Level Geography, Part 1 builds a foundation in systems thinking, energy flows, water and carbon cycles, tectonic activity, and landscape change.
自然地理研究塑造地球表面和大气圈的自然系统与过程。对于 Edexcel A-Level 地理，第一部分为系统思维、能量流动、水与碳循环、构造活动及景观变化打下基础。
1. Earth Systems and the Four Spheres | 地球系统与四大圈层
A system is a set of components linked by flows of energy and matter. Physical geography uses systems thinking to classify closed, open and isolated systems. Earth as a whole is nearly a closed system for matter but an open system for solar energy.
系统是由能量和物质流动联系起来的若干组成部分。自然地理运用系统思维将系统分为封闭系统、开放系统和孤立系统。地球整体对物质而言近似封闭系统，但对太阳能量而言是开放系统。
The four spheres are the atmosphere (air), hydrosphere (water), lithosphere (rock and soil), and biosphere (living organisms); the cryosphere (ice) is often treated separately because of its role in albedo and sea level.
四大圈层是大气圈（空气）、水圈（水）、岩石圈（岩石和土壤）和生物圈（生物）；由于冰冻圈（冰）在反照率和海平面中的作用，通常被单独讨论。
2. The Global Energy Budget and Atmospheric Circulation | 全球能量收支与大气环流
Incoming solar radiation is balanced by outgoing longwave radiation. Albedo, latitude, season and cloud cover control the uneven heating that drives atmospheric circulation and ocean currents.
输入的太阳辐射与输出的长波辐射相平衡。反照率、纬度、季节和云量控制着不均匀受热，从而驱动大气环流和洋流。
The tri-cellular model links the Hadley, Ferrel and Polar cells to surface pressure belts and wind patterns, explaining the location of deserts, rainforests and mid-latitude storms.
三圈环流模型将哈得莱环流、费雷尔环流和极地环流与地面气压带和风带联系起来，解释了沙漠、雨林和中纬度风暴的分布。
3. The Global Water Cycle | 全球水循环
Water moves between stores such as oceans, ice, groundwater, soils, lakes, the atmosphere and the biosphere through precipitation, evaporation, transpiration, condensation, runoff and infiltration.
水通过降水、蒸发、蒸腾、凝结、径流和下渗，在海洋、冰、地下水、土壤、湖泊、大气和生物等贮存库之间运动。
The water budget equation for a drainage basin is shown below, where P is precipitation, Q is runoff, E is evapotranspiration and ΔS is change in storage.
流域水量平衡方程如下，其中 P 为降水量，Q 为径流量，E 为蒸散发量，ΔS 为蓄水量变化。
P = Q + E + ΔS
4. Drainage Basin Hydrology and River Systems | 流域水文与河流系统
A drainage basin is an open system with inputs (precipitation), outputs (evaporation and runoff), stores (soil water, groundwater and surface storage) and flows (infiltration, throughflow and baseflow).
流域是一个开放系统，具有输入（降水）、输出（蒸发和径流）、储存（土壤水、地下水和地表蓄水）以及流动（下渗、侧向流和基流）。
Storm hydrographs show river discharge over time; the rising limb, peak discharge, lag time and falling limb respond to drainage density, vegetation cover, geology and land use.
洪水过程线展示河流流量随时间的变化；涨水段、洪峰流量、滞时和退水段受河网密度、植被覆盖、地质条件和土地利用的影响。
5. The Carbon Cycle and Climate Regulation | 碳循环与气候调节
Carbon is stored in the lithosphere, oceans, soils, plants and atmosphere, and transferred by photosynthesis, respiration, combustion, decomposition, burial and subduction.
碳储存在岩石圈、海洋、土壤、植物和大气中，并通过光合作用、呼吸作用、燃烧、分解、埋藏和俯冲等过程发生转移。
The slow carbon cycle involves geological stores such as limestone and fossil fuels; the fast cycle involves short-term exchanges between the atmosphere, oceans and living organisms.
慢速碳循环涉及石灰岩和化石燃料等地质储库；快速循环涉及大气、海洋和生物之间的短期交换。
6. Plate Tectonics and Tectonic Hazards | 板块构造与地质灾害
Lithospheric plates move by convection currents, slab pull and ridge push. Plate boundaries can be constructive, destructive, conservative or collision zones.
岩石圈板块因地幔对流、板块俯冲拉力和洋脊推力而运动。板块边界可分为建设型、破坏型、保守型和碰撞带。
Earthquakes occur where stress builds up and is suddenly released, especially at plate boundaries; volcanic activity is concentrated at constructive and destructive margins. Hazard risk depends on magnitude, depth, distance, population density and preparedness.
地震发生在应力积累并突然释放的地方，尤其是在板块边界；火山活动集中在建设型和破坏型边界。灾害风险取决于震级、深度、距离、人口密度和防灾准备。
7. Weathering, Erosion and Mass Movement | 风化、侵蚀与块体运动
Weathering breaks rock in place. Mechanical weathering includes freeze-thaw, salt crystallisation and exfoliation; chemical weathering includes carbonation, hydrolysis and oxidation.
风化在原位破坏岩石。机械风化包括冻融、盐结晶和剥落；化学风化包括碳酸化、水解和氧化。
Erosion removes and transports material by gravity, water, wind or ice. Mass movement, such as slides, slumps and rockfalls, occurs when shear stress exceeds shear strength on a slope.
侵蚀通过重力、水、风或冰搬运物质。块体运动（如滑坡、滑塌和岩崩）发生在斜坡上的剪切应力超过抗剪强度时。
8. Coastal Systems and Processes | 海岸系统与过程
Coasts are open systems with inputs of sediment from rivers and cliffs, transfers by longshore drift, and outputs to offshore bars and dunes. Wave type, tides and geology shape erosional and depositional landforms.
海岸是开放系统，沉积物输入来自河流和悬崖，通过沿岸漂移搬运，输出到近岸沙坝和沙丘。波浪类型、潮汐和地质塑造侵蚀地貌和沉积地貌。
Constructive waves build beaches, while destructive waves erode cliffs and form wave-cut platforms, caves, arches and stacks. Coastal management uses hard and soft engineering to reduce risk.
建设性波浪堆积海滩，破坏性波浪侵蚀悬崖并形成波切台、海蚀洞、海蚀拱和海蚀柱。海岸管理采用硬工程和软工程来降低风险。
9. Glacial Systems and Periglacial Environments | 冰川系统与冰缘环境
Glaciers form where accumulation exceeds ablation. They erode by plucking and abrasion, transport debris, and deposit till and moraines, creating cirques, arêtes, U-shaped valleys and druml
Published by TutorHao | A-Level Physics Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导