1.
igneous rock
Rock formed from the cooling and solidification of magma or lava. One of the three main rock types studied in geology, along with sedimentary and metamorphic rock.
花崗岩は火成岩の一種だ。
Granite is a type of igneous rock.
火成岩はマグマ}が{冷えて固まってできる。
Igneous rock is formed when magma cools and solidifies.
日本は火山が多いため、火成岩が広く分布している。
Because Japan has many volcanoes, igneous rock is widely distributed throughout the country.
Composed of 火成 (fire-formed) and 岩 (rock). One of the three fundamental rock classifications taught in Japanese science education, alongside 堆積岩 (sedimentary rock) and 変成岩 (metamorphic rock).
火成岩 is further divided into two main categories depending on where the magma cooled:
- 火山岩 (volcanic rock): cooled quickly at or near the surface, with fine-grained texture
- 深成岩 (plutonic rock): cooled slowly deep underground, with coarse-grained texture
COMMON COLLOCATIONS:
- 火成岩の種類: types of igneous rock
- 火成岩が分布する: igneous rock is distributed
- 火成岩の成分: composition of igneous rock
- 火成岩を観察する: to observe igneous rock
SIMILAR WORDS:
- 堆積岩: sedimentary rock — formed from accumulated sediment over time
- 変成岩: metamorphic rock — formed when existing rock is transformed by heat and pressure
- 火山岩: volcanic rock — a subcategory of igneous rock that cooled on the surface
- 岩石: rock (general term) — broader term for any type of rock