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balanced diet

range of nutrients needed to stay healthy.

Bar magnets

rectangular type of magnet with poles at each end


layer of rock; a stratum

Bedding plane

the boundary between one bed and the next

Bimetallic strip

device which moves as temperature changes, often part of an electronic heating control system


fluid responsible for transporting substances from part of the body to another.

body temperature

maintained temperature of the body, in humans 37 degrees Celsius.

Boiling point

the temperature at which a pure substance changes from a liquid to a gas (or a gas to a liquid)


when sediments are covered over by new sediments or other material