geology

geology — noun

1. the branch of science that examines the solid outer layers of Earth, how they fo

1.nounB2
Definition

the branch of science that examines the solid outer layers of Earth, how they formed, and how they have changed over time.

Example

Owen decided to study geology at university after spending summers hiking in the mountains.

study geology (verb + field of study)

The geology department at Devika's university owns a large collection of mineral samples.

geology department (noun modifier)

Common collocations
  • study geology
  • major in geology
  • geology department
  • geology professor
  • geology textbook
  • a degree in geology
Synonyms
  • earth science

    broader term that also covers oceanography, meteorology, and space science

  • geoscience

    more formal synonym, often used in academic and research contexts

Grammar Patterns

study + geology

major in + geology

professor/department + of + geology

Usage Note

Frequently used with academic verbs such as 'study', 'major in', and 'specialize in'. Also common as a modifier for nouns like 'department', 'course', 'textbook', and 'professor'.

Common Mistakes

I read a geology about volcanoes.
I read a geology textbook about volcanoes.
'geology' as a field of study is uncountable and cannot follow the article 'a'.
She graduated in geologies.
She graduated in geology.
'geology' does not have a plural form when referring to the field of study.

2. the rocks, soil, and other natural materials found in a specific location on Ear

2.nounC1
Definition

the rocks, soil, and other natural materials found in a specific location on Earth, and the way these materials are arranged underground.

Example

The geology of this region includes thick layers of limestone and soft sandstone.

the geology of [place]

Yael studied the local geology to understand why the river had changed its course.

Common collocations
  • the geology of
  • local geology
  • regional geology
  • complex geology
  • unusual geology
Synonyms

Grammar Patterns

the geology + of + [place]

[possessive] + geology

[adjective] + geology

Usage Note

Almost always preceded by a determiner — typically 'the' ('the geology of Taiwan') or a possessive ('the region's geology'). Often followed by 'of + [place]' to specify the location.

Common Mistakes

The geologies of these two islands are different.
The geology of these two islands is different.
'geology' in this sense remains uncountable even when comparing multiple places.
I studied geology of mountain.
I studied the geology of the mountain.
the definite article 'the' is required before 'geology' when specifying a location.

Word family

Synonym discussion

Sense: noun/1

Geology, earth science, geoscience, and geography are related but distinct fields. Geology is the most specific of the four, focusing on the solid materials that make up Earth — its rocks, minerals, fossils, and tectonic structures. Earth science is a broader umbrella that includes geology plus oceanography, atmospheric science, and planetary science. Geoscience is often used interchangeably with earth science, though in academic settings it sometimes refers more narrowly to geology and geophysics. Geography is different in scope: it studies the surface of Earth, including both physical features (mountains, rivers, climate) and human activity (population distribution, urban development). For example, a geologist examines the chemical layers within a rock sample, while a geographer maps how a river shapes the farmland around it.

geology ↗earth sciencegeosciencegeography ↗

Common collocations

Nouns

  • geology student
  • geology course
  • geology degree
  • geology professor
  • geology textbook

Phrases

  • department of geology
  • field of geology
  • principles of geology

Prepositions

  • in geology
  • of geology
  • with geology

Etymology

GreekLatinEnglish

The word 'geology' was formed from the Greek roots 'gē' (earth) and 'logia' (study or discourse). It first appeared in English in the late 18th century, based on the Latin 'geologia', to describe the emerging scientific discipline that investigates the earth's composition and history through its rocks and minerals.