aqua
bio
geo
graph
hydra
100

a diver who lives & explores underwater

aquanaut

100

a substance used to cure infections

antibiotic

100

relating. to. or using Earth's internal heat 

geothermal

100

pictures, symbols, words painted, sprayed or drawn on a wall or building

graffiti

100

state of lost body fluids

dehydrated

200

living or growing in water

aquatic

200

science that deals with living things. and processes vital to living things

biology

200

a person. who studies rocks and soil

geologist

200

a signature

autograph

200

operated by the pressure of a fluid such as water or oil

hydraulic

300

having to do with water

aqueous

300

a true story of someone's life

biography

300

the study of the natural features, population, and human activity of a region

geography

300

an obsolete system of sending messages by transmitting signals over wires

telegraph
300

a fixture in a street or public place that provides water

hydrant

400

A tank, bowl, or other water-filled enclosure in which living fish or other aquatic animals and plants are kept.

aquarium

400

capable of being slowly decomposed by bacteria 

biodegradable
400

of or based on the physical features of a region

geographic

400

a section of a piece of writing

paragraph

400

to add water or moisture

hydrate

500

a structure that carries a large amount of water in the form of a bridge, pipe, tube or channel

aquaduct

500

a biological substance or condition that puts people or the environment at risk.

biohazard

500

art or science. of growing plants in soil

geoponics

500

a shiny, gray mineral that is used in pencils

graphite

500

to slide on a wet surface; when a layer of water on the road lift the tires off of it

hydroplane

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