科学为什么·英语30篇（1）

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为什么火山会在长期沉寂后突然喷发？

Volcanoes often stay quiet for years or centuries while magma slowly rises, accumulates, and builds pressure deep underground.
As magma cools slightly, crystals form and gases like water vapor, CO₂, and sulfur dioxide become trapped.
When pressure from these expanding gases exceeds the strength of overlying rock, the volcano erupts violently.
Earthquakes often increase before eruptions because moving magma cracks surrounding crustal rocks.
Ground swelling and gas emissions also signal rising magma—but predicting exact timing remains scientifically challenging.
Some volcanoes erupt quietly with lava flows; others explode due to high gas content and sticky, silica-rich magma.
Long dormancy doesn’t mean safety—instead, it may indicate a large, pressurized magma chamber waiting to release.
Monitoring tools like seismometers, GPS, and gas analyzers help scientists assess eruption likelihood more accurately today.

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

Earthquakes often increase before eruptions because moving magma cracks surrounding crustal rocks. 喷发前地震频发，是因为移动的岩浆使周围地壳岩石破裂。
Ground swelling and gas emissions also signal rising magma—but predicting exact timing remains scientifically challenging. 地面隆起和气体释放也预示岩浆上升，但精确预测喷发时间仍是科学难题。
When pressure from these expanding gases exceeds the strength of overlying rock, the volcano erupts violently. 当这些膨胀气体产生的压力超过上覆岩石的承受极限时，火山便剧烈喷发。

这篇中文题目最接近哪一句？为什么火山会在长期沉寂后突然喷发？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？火山常在地下岩浆缓慢上升、聚集并积聚压力的过程中，沉寂数年甚至数百年。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 Volcanoes Erupt After Long Quiet Periods? How to cook noodles A maths worksheet

Earthquakes often increase before eruptions because moving magma cracks surrounding crustal rocks.

Earthquakes often increase before eruptions because moving magma cracks surrounding crustal rocks.

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：Earthquakes often increase before eruptions because moving magma cracks surrounding crustal rocks.