geology
n. uncountablen. the study of the Earth's physical structure and the rocks it is made of. It helps you understand how the planet has changed over millions of years.
n. the scientific study of the physical structure and substance of the Earth, including its history and the processes that act on it.
She decided to study geology to learn about volcanoes.
The local geology consists mostly of limestone, which explains why there are so many caves in the area.
Understanding the regional geology is essential for engineers before they begin constructing heavy infrastructure like dams or skyscrapers to ensure the ground can support the weight.
From geo- + -logy, partly after Renaissance Latin geōlogia, from Ancient Greek γεω- (geō-, “earth”) + Latin -logia (“the study of”), from Ancient Greek -λογία (-logía).
Uncountable when referring to the field of study; can be used with 'the' to refer to the specific rock structure of an area.