什么是裂谷（rift valley）？
What is a rift valley?
裂谷是岩石圈被拉伸变薄、中央下陷形成的狭长凹陷，常发育在大陆张裂的早期阶段。东非大裂谷就是板块未来可能分裂的活证据。
A rift valley is a long, narrow depression where the lithosphere is stretched thin and the center drops down, often marking the early stage of continental splitting. The East African Rift shows a continent actively pulling apart.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#裂谷 #拉伸 #东非大裂谷
喀斯特地貌（如溶洞、天坑）是怎么形成的？
How do karst landscapes (such as caves and sinkholes) form?
在石灰岩、白云岩等可溶性岩石分布区，略带酸性的雨水沿裂隙溶蚀岩石，长期作用下形成地下溶洞、地下河，洞顶塌陷则成天坑（落水洞）。我国桂林山水、云南石林都是典型的喀斯特地貌。
In regions of soluble rock such as limestone and dolomite, mildly acidic rainwater dissolves the rock along fractures, over time carving underground caves and streams; when a cave roof collapses, it forms a sinkhole. Guilin's peaks and the Stone Forest in Yunnan, China, are classic karst landscapes.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#喀斯特 #溶洞 #天坑 #石灰岩 #溶蚀
河流的“河曲”（meander）和“牛轭湖”是怎么形成的？
How do river meanders and oxbow lakes form?
河流在平缓地带侧蚀加强，凹岸冲刷、凸岸堆积，使河道逐渐弯成蛇曲（meander）。当洪水切穿两个相邻河弯的颈部，河流改走直道，被遗弃的旧河弯便封闭成新月形的牛轭湖。
On flat terrain a river erodes more on its sides, cutting into outer banks and depositing on inner ones, so the channel gradually bends into snake-like meanders. When a flood cuts across the narrow neck between two bends, the river takes a shortcut and the abandoned loop is sealed off into a crescent-shaped oxbow lake.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#河曲 #牛轭湖 #侧蚀 #凹岸 #凸岸
沙漠是如何形成的？
How do deserts form?
沙漠多出现在副热带高压带（干燥少雨）或山脉背风面（雨影效应）等蒸发远大于降水的地区。它们并非都炎热，也有寒冷的极地沙漠。
Deserts form where evaporation far exceeds rainfall, such as under subtropical high pressure or on the dry lee side of mountains (rain shadow). Not all are hot; there are also cold polar deserts.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#沙漠 #副热带高压 #雨影
什么是“滑坡”（landslide）？常见触发因素有哪些？
What is a landslide, and what are common triggering factors?
滑坡是斜坡上的岩土体在重力作用下失稳、整体向下滑动的现象。常见触发因素包括持续强降雨使土体饱和、地震震动、火山活动、人类削坡或开挖，以及河道或波浪的侵蚀掏空坡脚。
A landslide is the downslope movement of rock or soil under gravity when a slope becomes unstable. Common triggers include prolonged heavy rain that saturates the ground, earthquake shaking, volcanic activity, human cutting or excavation of slopes, and erosion at the toe by rivers or waves.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#滑坡 #重力 #强降雨 #地震 #坡脚侵蚀
什么是洞穴（溶洞）？
What is a cave (solution cavern)?
溶洞是地下水长期溶蚀可溶性岩石（如石灰岩）形成的地下空洞，常伴生钟乳石和石笋。它们是喀斯特地貌的重要组成部分。
A solution cave is an underground void hollowed out by groundwater dissolving soluble rock like limestone, often bearing stalactites and stalagmites. Such caves are a key part of karst terrain.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#溶洞 #石灰岩 #钟乳石
河流是如何通过曲流与牛轭湖不断改造平原的？
How do rivers reshape floodplains through meandering and oxbow lakes?
蜿蜒河流的外侧受侵蚀、内侧沉积，使河道侧向摆动并不断加宽曲流带。当洪水冲开曲颈最窄处抄近路，废弃的河曲便与主河道隔绝，形成牛轭湖。利奥波德与沃尔曼在1957年用统计关系描述了河道形态的这种演化。
A meandering river erodes its outer bank and deposits on the inner one, swinging sideways and widening the meander belt. When a flood cuts across the narrow neck of a loop, the abandoned bend is isolated as an oxbow lake. Leopold and Wolman described this morphological evolution with statistical relations in 1957.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#曲流 #牛轭湖 #河流地貌
海平面变化与海岸侵蚀如何共同重塑大陆边缘？
How do sea-level change and coastal erosion together reshape continental margins?
海平面上升会淹没低平海岸并加剧风暴潮侵蚀，而海退则暴露出新的潮坪与阶地。波浪与沿岸流持续搬运泥沙，使岬角被削平、海湾被充填，形成动态平衡的海岸线。伯德在《海岸地貌学》中系统描述了这些过程的相互作用。
Rising sea level submerges low coasts and intensifies storm-surge erosion, while regression exposes new tidal flats and terraces. Waves and longshore currents constantly move sediment, trimming headlands and filling bays into a dynamically balanced shoreline. Bird's Coastal Geomorphology systematically describes these interacting processes.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#海岸侵蚀 #海平面 #海岸地貌
尼罗河等许多大河三角洲过去数千年持续向海造陆，为什么近几十年反而转为净蚀退？
Why did great deltas like the Nile build land seaward for millennia yet tip into net retreat within recent decades?
三角洲本质是一笔泥沙收支账：河流来沙超过沉降与海侵造成的损失就淤进，反之则蚀退。现代大坝拦截了绝大部分泥沙——阿斯旺高坝建成后尼罗河入海泥沙减少逾九成，河道采砂和水土保持又进一步削减供沙；与此同时沉积物自然压实、地下水与油气开采加速地面下沉，海平面还在上升，收支逆转使全球多数三角洲转入净淹没。
A delta is a sediment budget: land builds when river supply exceeds losses to compaction, subsidence and sea-level rise, and drowns otherwise. Modern dams intercept most of the load — Nile sediment reaching the sea fell by more than ninety percent after the Aswan High Dam — while sand mining trims supply further. Natural compaction, groundwater-driven sinking and rising seas settle the account from below, pushing most major deltas into net drowning.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#泥沙供给 #三角洲下沉 #海平面上升
山脉是怎么形成的？
How do mountains form?
造山运动（orogeny）多发生在板块碰撞处，地壳被挤压褶皱、断裂并抬升成山，如喜马拉雅山由印度与欧亚板块碰撞而成。火山活动也能单独堆出山脉。
Mountain building (orogeny) mostly occurs where plates collide, folding, faulting, and lifting the crust into ranges—the Himalayas rose as India met Eurasia. Volcanism can also build mountains on its own.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#造山运动 #褶皱 #喜马拉雅
什么是半岛？
What is a peninsula?
半岛是三面环水、一面与大陆相连的地块，如阿拉伯半岛和朝鲜半岛。它的气候和生态常受海洋显著影响。
A peninsula is a piece of land nearly surrounded by water but connected to the mainland on one side, like Arabia or Korea. Its climate and ecology are strongly shaped by the nearby sea.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#半岛 #临海 #陆地
什么是峡谷？
What is a canyon?
峡谷是河流长期下切侵蚀在坚硬岩层中刻出的深而窄的谷地，两侧常为陡崖。美国科罗拉多大峡谷就是由科罗拉多河数百万年切割而成。
A canyon is a deep, narrow valley cut by a river into resistant rock over long time, usually with steep cliffs on both sides. Arizona's Grand Canyon was carved by the Colorado River over millions of years.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#峡谷 #下切 #科罗拉多河
什么是山脉？
What is a mountain?
山脉是相对于周围明显高耸的地形，通常由构造抬升或火山活动形成。它们以较大的高度、陡坡和局部气候差异区别于丘陵。
A mountain is a landform that rises prominently above its surroundings, usually built by tectonic uplift or volcanism. Its height, steep slopes, and distinct local climate set it apart from hills.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#山脉 #抬升 #地形
什么是高原？
What is a plateau?
高原是海拔较高、顶面相对平坦广阔的抬升地形，边缘常以陡坡与低地相接。它可由火山熔岩覆盖或构造抬升形成，如青藏高原。
A plateau is an elevated area with a broad, relatively flat top, often bounded by steep slopes dropping to lower land. It can form from lava flows or tectonic uplift, as with the Tibetan Plateau.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#高原 #平坦 #抬升
河流入海处为什么会堆积出三角洲?
Why do rivers pile up deltas where they meet the sea?
直答:河口水面展宽、流速骤降,水流挟带的泥沙超出其输送能力而落淤,长期加积并向海推进便成三角洲。机理:粗颗粒先行沉降,细颗粒遇咸淡水混合发生絮凝而加速下沉;泥沙持续堆积迫使河道分汊改道,塑成鸟足状、扇状等形态;波浪与潮汐越强,泥沙沿岸搬走越多,三角洲轮廓也越平直。
At the mouth the current spreads out and slows sharply, so it can no longer carry its load: coarse grains settle first, while clays flocculate on meeting salty water and drop out faster. Sediment keeps accumulating, pushing the shoreline seaward and forcing channels to split and swing, which shapes birdfoot or arcuate plains. The stronger the waves and tides, the more material is swept alongshore and the straighter the resulting coast.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Wright,《Sediment transport and deposition at river mouths: A synthesis》,Geological Society of America Bulletin,1977
Wright, 'Sediment transport and deposition at river mouths: A synthesis', Geological Society of America Bulletin, 1977
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1130/0016-7606(1977)88<857:stadar>2.0.co
#三角洲 #河口沉积 #絮凝作用
为什么密西西比河三角洲呈鸟足状,而有的三角洲却是平滑弧形或喇叭口形?
Why is the Mississippi delta shaped like a birdfoot while others form smooth arcs or trumpet mouths?
直答:取决于河流输入、波浪改造与潮汐搬运三种动力的相对强弱。机理:河流作用占优时,泥沙沿分汊河道快速向海推进,形成外凸的鸟足状,如密西西比三角洲;强波浪把河口沙体沿岸再分配,塑成平滑弧形,如尼日尔和圣弗朗西斯科河三角洲;强潮流往复冲刷分流水道,则造就漏斗状河口与线状沙脊,如恒河—布拉马普特拉河三角洲。
Delta outline records which of three processes prevails: river supply, wave reworking, or tidal transport. River-dominated systems push sediment seaward through branching distributaries into protruding lobes, like the birdfoot Mississippi. Strong waves redistribute mouth sands alongshore into smooth arcs, as at the Niger and São Francisco. Vigorous tides scour channels back and forth, carving funnel mouths fringed with linear ridges, as at the Ganges-Brahmaputra.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#三角洲分类 #河流主导 #波潮改造
物理风化和化学风化有什么区别？
What is the difference between physical and chemical weathering?
物理风化只把岩石机械破碎成更小颗粒，不改变其矿物成分，如冻融、盐结晶和热胀冷缩。化学风化则通过水、氧和酸与矿物反应，生成新矿物或溶解物质，如长石变为黏土。两者常共同作用，决定土壤与沉积物的形成。
Physical weathering only breaks rock into smaller pieces without changing its minerals, through freezing, salt crystal growth, or thermal expansion. Chemical weathering reacts minerals with water, oxygen, and acids to form new or dissolved material, such as feldspar turning to clay. The two usually act together, controlling soil and sediment formation.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#物理风化 #化学风化 #岩石破碎