-ology's & -onomy's
100

Many people at MCC majored in this in college; the scientific study of the human mind and behavior

Psychology 

200

How come weathermen get paid to get the forecast wrong? This -ology is the study of Earth's atmosphere and the physical processes that cause weather

Meteorology

300

The scientific study of life and living organisms

Biology

400

Involving naming, describing, and organizing items into groups based on shared characteristics, this is known as the science of classification

Taxonomy