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Hydro-
-ology
sub
tele
100
the study of liquids
What is hydrology
100
the study of life
What is biology
100
a boat that stays under water
What is a submarine
100
you call with this invention
What is a telephone
200
a system using liquids that causes lift
What is hydraulic
200
the study of heat
What is thermology
200
below zero temperature
What is sub zero
200
to get to far away places very quickly
What is teleport
300
a boat that stays above water
What is hydroplane
300
the study of earth
What is geology
300
A train that's below the ground
What is a subway
400
generates electricity using liquid
What is hydroelectric
400
the study of stars
What is astrology
400
to go below the surface of the water
What is to Submerge
500
the process of causing something to absorb liquid
What is hydration
500
the study of bones
What is osteology
500
a teacher that is below the normal teacher
What is a substitute