地核是怎么给地球“发电”、造出磁场的?
How does Earth's core 'generate' our magnetic field?
外地核是液态的铁镍,因热量散失而缓慢对流,加上地球自转的科里奥利力把流动组织成旋涡,导电液体流动产生电流,电流再维持磁场,这就是地核发电机说。
The liquid iron-nickel outer core convects as it cools; Earth's rotation twists the flow via the Coriolis force into spirals, and moving conductor creates electric currents that sustain a magnetic field—the geodynamo.
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
舒良树 主编,《普通地质学》第3版(曾获全国首届优秀教材一等奖)
Shu Liangshu ed., General Geology, 3rd ed. (winner of the 1st National Excellent Textbook Award)
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787116123892(豆瓣书目条目: 普通地质学)
#地核发电机 #对流
内地核明明那么热,为什么却是固体而不是液体?
The inner core is extremely hot—why is it solid rather than liquid?
内地核处在地球最深处,压力极大,高压把铁的熔点抬得比实际温度还高,所以铁被“压成”了固体。
The inner core sits under enormous pressure, which raises iron's melting point above its actual temperature, so the iron is squeezed into a solid.
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
舒良树 主编,《普通地质学》第3版(曾获全国首届优秀教材一等奖)
Shu Liangshu ed., General Geology, 3rd ed. (winner of the 1st National Excellent Textbook Award)
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787116123892(豆瓣书目条目: 普通地质学)
#内地核 #高压
地球最中心有多热,和太阳表面比呢?
How hot is Earth's very center, compared with the Sun's surface?
地核温度大约 5000 到 6000 摄氏度,和太阳表面的温度差不多热。
The core is about 5000–6000°C, roughly as hot as the surface of the Sun.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
舒良树 主编,《普通地质学》第3版(曾获全国首届优秀教材一等奖)
Shu Liangshu ed., General Geology, 3rd ed. (winner of the 1st National Excellent Textbook Award)
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787116123892(豆瓣书目条目: 普通地质学)
#地核温度 #热度