英语

火山岩是指在火山喷发过程中喷出的熔岩在地表或地下冷却凝固形成的岩石。它的主要成分是硅酸盐，包括火山玄武岩、安山岩、流纹岩等。在地质学上，火山岩又被称为火成岩。

How to pronounce: [vɒlˈkeɪnɪk rɒk]

Usage:

火山岩是一种常见的地质学术语，通常用于描述由火山活动形成的岩石。它可以被用作名词或形容词，在句子中通常位于名词前面。

Example sentences:

1. The island is formed by layers of volcanic rock.

这个岛屿是由层层堆积的火山岩形成的。

2. The road was blocked by a large piece of volcanic rock.

一块巨大的火山岩挡住了道路。

3. The landscape was covered in black volcanic rocks.

景观被黑色的火山岩覆盖着。

4. The geologist studied the composition of the volcanic rock samples.

地质学家研究了这些火山岩样本的组成。

5. The village was built on of a dormant volcano, surrounded by layers of volcanic rock.

这个村庄建在一座休眠火山之上，周围都是层层的火山岩。

Synonyms and usage:

1. Lava - molten rock that flows out of a volcano during an eruption.

Example: The lava from the volcano destroyed several villages.

2. Magma - molten rock beneath the earth's surface.

Example: The magma chamber beneath the volcano was starting to fill up.

3. Tuff - a type of volcanic rock formed from compacted volcanic ash.

Example: The cliffs were made of layers of tuff, showing the history of volcanic eruptions.

4. Pyroclastic - relating to fragments of rock and lava ejected from a volcano during an eruption.

Example: The pyroclastic flow from the volcano caused widespread destruction.

5. Caldera - a large crater at the of a volcano formed by the collapse of its cone.

Example: The caldera at the of Mount Vesuvius is a popular tourist attraction.

Editor's summary:

火山岩是由火山活动形成的一种岩石，主要成分是硅酸盐。它可以被用作名词或形容词，在句子中通常位于名词前面。它的同义词包括熔岩、岩浆、火山碎屑等。火山岩在地质学和旅游领域都有重要的意义，值得我们深入了解。