人口转变理论描述什么过程？
What does the demographic transition theory describe?
它描述社会从高低出生、高低死亡，经死亡率先降、出生率后降，最终走向低出生、低死亡的阶段演变。
It describes the shift from high birth and death rates through falling mortality then fertility, to a low-birth-low-death equilibrium.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
John Weeks,《Population: An Introduction to Concepts and Issues》Cengage 多版
J. R. Weeks, Population: An Introduction to Concepts and Issues, Cengage, various editions
独立核验依据 · Independent verification: 核验依据 2 ARCHIVE 标识 populationintrod0000week_o0n4：Population : an
#人口转变 #生育率
板块构造如何塑造地形？
How does plate tectonics shape terrain?
岩石圈分成若干刚性板块，漂在软流圈上，靠俯冲下拉与洋脊前推带动，速度约每年几厘米，与指甲生长同量级；但千万年累积就是上千公里，够开合一个大洋。地貌随边界类型而定：碰撞带地壳缩短增厚成高山与高原；张裂带成洋中脊与裂谷；俯冲带留下海沟与火山弧。易混的是地形不只由内力刻成，抬升与侵蚀同时在跑，海拔是两者拉锯的结果；火山地震也大多贴着边界，板内与热点是例外。
The lithosphere is split into a handful of rigid plates riding the flowing asthenosphere, pulled down by subducting slabs and pushed along by ridges, at roughly a few centimetres a year, about the growth rate of a fingernail. But tens of millions of years add up to over a thousand kilometres, enough to open and shut an ocean whole. Landforms follow boundary type: collision shortens and thickens the crust into mountains and plateaus, rifting builds mid-ocean ridges and rift valleys, subduction leaves a trench and a volcanic arc. What gets mixed up is that interior forces do not carve the map alone — uplift and erosion run at the same time, so elevation is their tug of war, and volcanoes and quakes mostly hug the plate boundaries, with intra-plate and hotspot cases as exceptions.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
Stein & Wysession,《地震学、板块与构造学导论》第2版,剑桥大学出版社,2013
C. Stein and M. Wysession, An Introduction to Seismology, Plates, and Tectonics, 2nd ed., Cambridge University Press, 2013
#板块构造 #地形
为什么一些地区人口更密集？
Why are some regions more densely populated?
宜居气候、肥沃土地、河流与就业机会吸引人口，而极端地形与干旱则限制聚居。
Temperate climate, fertile land, rivers, and jobs attract people; harsh terrain and aridity limit settlement.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
John Weeks,《Population: An Introduction to Concepts and Issues》Cengage 多版
J. R. Weeks, Population: An Introduction to Concepts and Issues, Cengage, various editions
独立核验依据 · Independent verification: 核验依据 2 ARCHIVE 标识 populationintrod0000week_o0n4：Population : an
#人口密度 #宜居性
什么是粮食安全？
What is food security?
粮食安全指所有人随时随地都能获得充足、安全、营养的食物，以满足健康生活的需要。
Food security means all people have reliable access to sufficient, safe, nutritious food for a healthy life.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
John Weeks,《Population: An Introduction to Concepts and Issues》Cengage 多版
J. R. Weeks, Population: An Introduction to Concepts and Issues, Cengage, various editions
独立核验依据 · Independent verification: 核验依据 2 ARCHIVE 标识 populationintrod0000week_o0n4：Population : an
#粮食安全 #农业
七大洲是哪些？
What are the seven continents?
亚洲、非洲、北美洲、南美洲、南极洲、欧洲、大洋洲。
They are Asia, Africa, North America, South America, Antarctica, Europe, and Oceania.
难度 入门 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#大洲 #地理
什么是人口迁徙？
What is migration?
迁徙指人跨越一定距离改变常住地的移动，可分为国内迁徙与国际迁徙。
Migration is the movement of people changing residence across a distance, either within or across countries.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
John Weeks,《Population: An Introduction to Concepts and Issues》Cengage 多版
J. R. Weeks, Population: An Introduction to Concepts and Issues, Cengage, various editions
独立核验依据 · Independent verification: 核验依据 2 ARCHIVE 标识 populationintrod0000week_o0n4：Population : an
#迁徙 #人口