地質(ちしつ)

ちしつ
noun
geology, geological features
geographyscience
1. geological features, geological composition
The nature and composition of the ground or earth in a particular area, including rock types, soil, and underground structures.
この地域(ちいき)の地質(ちしつ)は不安定(ふあんてい)だ。
The geology of this area is unstable.
地質(ちしつ)調査(ちょうさ)の結果(けっか)、断層(だんそう)が見(み)つかった。
A geological survey found a fault line.
建設(けんせつ)前(まえ)に地質(ちしつ)調査(ちょうさ)を行(おこな)う必要(ひつよう)がある。
It is necessary to conduct a geological survey before construction.
2. geology (the science), in compounds
In compounds, the scientific study of the earth's structure and substance: 地質学(ちしつがく) (geology), 地質学者(ちしつがくしゃ) (geologist). 地質(ちしつ) on its own names the ground itself (sense 1), not the field.
地質(ちしつ)学(がく)を専攻(せんこう)している。
I am majoring in geology.
地質学 = geology (academic subject)
地質(ちしつ)学者(がくしゃ)が火山(かざん)地帯(ちたい)の岩石(がんせき)を分析(ぶんせき)している。
Geologists are analyzing rocks from the volcanic zone.
地質(ちしつ)学(がく)は地球(ちきゅう)の歴史(れきし)を岩石(がんせき)や地層(ちそう)から読(よ)み解(と)く学問(がくもん)だ。
Geology is a discipline that reads the history of the Earth from rocks and strata.

Compounds

USAGE (construction):
Before building, a 地質(ちしつ)調査(ちょうさ) checks ground stability, soil composition and groundwater, which matters in earthquake-prone Japan.

Related Words

Compare: 土質(どしつ) (soil quality)
general
Added 2026.1.13 20:35 · Revised 2026.10.15 21:45
04000/04055_chishitsu