conservation

nouns

an occurrence of improvement by virtue of preventing loss or injury or other change
is derived from
is derived from
the preservation and careful management of the environment and of natural resources
is derived from
is derived from
is a type of (narrower)
the activity of protecting something from loss or danger
(physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations
is derived from
domain category
the science of matter and energy and their interactions
"his favorite subject was physics"
is a type of (narrower)
a basic truth or law or assumption
"the principles of democracy"