hydro
What is a hydroplane?
A light, fast motor boat that skims over the top of water.
Works by itself.
Automatic
The study of life.
Biology
The study of the earth.
Geology
To remove water or moisture from something.
To sign your name.
autograph
A life story.
Biography
The study of places.
Geography
What is Hydrophobia?
A fear of water?
A biography about yourself.
autobiography
Biopsy
A study of living tissue.
Geothermal means...
Earth's heat.