9. what subspecialty of earth science studies patterns of weather over a long period of time?
a. geochemistry b. climatology c. tectonics
d. paleontology

B. Climatology

Explanation:

Earth science studied the patterns of weather over a long period of time is called climatology. Weather is shorter phenomenon and day to day activities whereas climate is the longer and average climatic conditions over a period of  30 years. Climatology deals with the study about the temperature, precipitation, humidity, and pressure in the specific area in the world. Tectonics is the branch of the geomorphology which deals about the inner and outer surface of the earth.