geology [d 3 i:alad 3 i] n.
Geology is the study of the Earth’s natural structures and how they change.
—► Because he studied geology, he knew how the mountains were formed.
harness [ha ;mis] v.
To harness something means to control and use it, usually to make energy.
-*■ The sails harness the wind in order to move.
intellect [fntalekt] n.
An intellect is a person’s ability to understand things easily.
—»She was known for her quick and strong intellect as well as her beauty.
k e e n [ki:n] adj.
If someone is keen, they are intelligent.
—> Only the keenest of students could have solved that math problem.mythology [miedlad30 n.
Mythology is a group of stories from a particular country or region.
—► Egyptian mythology was the basis for a religion.physiology [fizialad 3 i] n.
Physiology is the study of the various parts of living things.
-» His work in physiology helped him understand how the human body works.radioactive [reidiousektiv] adj.
If something is radioactive, then it lets out, or is related to, radiation.
—► Radioactive materials can be very bad for anyone’s health.relativity [relativati] n.
Relativity is a set of ideas about time and space developed by Albert Einstein.
—* Relativity teaches that light travels at the same speed in the universe.sociology [sousialad 3 i] n.
Sociology is the study of human society, its organizations, and problems.
—► Sociology teaches that people’s problems are a result of their society.theoretical [ekaretikal] adj.
If something is theoretical, it is based on theory rather than experience.
-* His conclusion was only theoretical and not meant to be publicized.