🪨 岩石圈：漂浮在“软糖”上的硬壳🪨 Lithosphere: the Hard Shell on Soft Candy
上一片潜到地心，看了滚烫的地核。这一片回到脚下：我们站的地面，其实是一块会漂的硬壳。🌍 蓝色星球向导带你切开地球看分层。Last leaf, we dived to the core and saw the blazing heart. This leaf returns to your feet: the ground you stand on is a hard shell that drifts. 🌍 Your blue-planet guide slices Earth open to show the layers.
第 1 步：岩石圈不等于地壳Step 1: The lithosphere is not the crust
很多人把岩石圈当成地壳，其实它更大一圈。Many mistake the lithosphere for the crust — it is actually one size bigger.
地壳只是最外层那张薄皮。岩石圈是硬整体：地壳加上地幔最顶部，约一百公里厚。它硬而脆，会断裂。它的下面是软流层，又软又热。The crust is only the thin outer skin. The lithosphere is one hard whole: the crust plus the very top of the mantle, about a hundred kilometres thick. It is hard and brittle, and it can crack. Beneath it lies the soft, hot asthenosphere.
整块硬壳并不完整，它碎成了十几块。The hard shell is not whole — it broke into a dozen pieces.
第 2 步：地球表面是十几块拼图Step 2: Earth's surface is a dozen-piece puzzle
岩石圈碎成十几块板块。太平洋板块最大，几乎半个地球。欧亚、非洲、美洲板块各管一片。板块边线用红线标出，就是下片故事的起点。The lithosphere broke into about a dozen plates. The Pacific Plate is the biggest, covering almost half the planet. The Eurasian, African and American plates each run their own patch. Their red edges are where the next story begins.
板块这么硬，怎么动得起来？因为脚下是软的。Plates are so hard — how can they move? Because what lies underfoot is soft.
第 3 步：硬壳浮在软层上Step 3: The hard shell floats on soft stuff
硬板块像冰块浮在水上，浮在软流层上慢慢漂。板块边界互相推挤，那里就是地质活动带：火山、地震都爱挤在边界上。Hard plates float like ice cubes on water, drifting slowly on the asthenosphere. Where plate edges push against each other you get the active belts: volcanoes and earthquakes crowd onto the boundaries.
🎮 你来拼板块（30 秒）🎮 Your turn: build the plates (30 seconds)
道理讲完了。先拼出四大板块、看它们漂浮；再数板块、找边界。Theory done. Build the four big plates and watch them float; then count plates and find boundaries.
一句话记住它：岩石圈是硬整体（地壳加地幔顶部），碎成十几块板块浮在软层上，边界是火山地震带。Remember it in one line: the lithosphere is one hard shell (crust plus top mantle), broken into a dozen plates floating on soft stuff, with volcano-quake belts on the edges.
岩石圈不等于地壳：它是地壳加地幔顶部，硬而脆Not the crust: crust plus top mantle, hard and brittle十几块板块：太平洋最大，欧亚非洲美洲各管一片About a dozen plates: the Pacific biggest, Eurasia, Africa and the Americas each hold a patch板块边界是活动带：火山地震都挤在边线上Edges are active belts: volcanoes and quakes crowd the lines
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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