十万个为什么·科学阅读30篇（4）

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为什么有些火山喷发蓝色火焰而非红色岩浆？

Blue flames at volcanoes like Indonesia’s Kawah Ijen come from ignited sulfur vapor—not burning lava.
Underground sulfur deposits melt and rise through cracks, then ignite spontaneously upon contact with air.
The combustion produces bright blue flames visible even in daylight and emits toxic sulfur dioxide gas.
Temperatures exceed 600°C, but the blue color comes from excited molecular sulfur emitting at 450 nm.
Unlike red-orange lava glow, which results from thermal radiation, this is chemiluminescence from chemical reactions.
Local miners collect cooled sulfur for industrial use despite hazardous working conditions and poor ventilation.
Scientists use spectrometers to distinguish sulfur flame signatures from other volcanic heat sources.
This phenomenon occurs only where high-sulfur magma interacts with hydrothermal systems near the surface.
Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls.
Monitoring flame intensity helps volcanologists assess subsurface gas pressure and eruption risk.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls. 夜间摄影可捕捉到沿火山口壁奔流而下的壮观蓝色火河。
Monitoring flame intensity helps volcanologists assess subsurface gas pressure and eruption risk. 监测火焰强度有助于火山学家评估地下气体压力及喷发风险。
Scientists use spectrometers to distinguish sulfur flame signatures from other volcanic heat sources. 科学家用光谱仪区分硫火焰特征与其他火山热源信号。

这篇中文题目最接近哪一句？为什么有些火山喷发蓝色火焰而非红色岩浆？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？印尼卡瓦伊真火山等地的蓝色火焰源自燃烧的硫蒸气，而非熔岩燃烧。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Do Some Volcanoes Emit Blue Flames Instead of Red Lava? How to cook noodles A maths worksheet

Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls.

Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls.