Metamorphic rock did not start as that kind of rock. Heat, heavy pressure, or hot water worked on it for a very long time, and its insides lined up or grew new crystals, so it became a different rock.

Metamorphic rock變質岩 did not start as that kind of rock一開始並不是這種岩石。Heat, heavy pressure, or hot water熱、強大的壓力，或熱水 worked on it for a very long time長時間作用在它身上，and its insides lined up or grew new crystals讓它內部重新排列或長出新的結晶，so it became a different rock於是它就變成了另一種岩石。

The schoolbook pairs are marble from limestone and slate from shale. Igneous rock is born from melt; sedimentary rock is laid down in layers; metamorphic rock is the one that was cooked and squeezed after it was already rock.

The schoolbook pairs are課本裡常舉的例子是 marble from limestone石灰岩變成大理石，and slate from shale頁岩變成板岩。Igneous rock is born from melt火成岩是從融化的岩漿誕生的；sedimentary rock is laid down in layers沉積岩是一層一層堆積形成的；metamorphic rock is the one that was cooked and squeezed after it was already rock變質岩則是本來已經是岩石、後來又被加熱擠壓的那一種。

People also use metamorphic when they talk about animals that change form, because the word sits on metamorphosis — though in a geology class they mean this slow underground change. It is a school-and-science word, not a café word.

People also use metamorphic人們也會用metamorphic這個字 when they talk about animals that change form來講會變形的動物，because the word sits on metamorphosis因為這個字跟metamorphosis（變態、蛻變）同一個字根——though in a geology class they mean this slow underground change不過在地質課裡指的是這種在地底下慢慢發生的變化。It is a school-and-science word這是課堂與科學用語，not a café word不是聊天閒聊會用的字。