amount of material in the volume of an object
non-human related object, process, or situation that could cause loss of life, personal injury, and/or loss of property
the concentration of any substance or form of energy reaches a proportion that adversely affects animals, plants, or people.
interpretation of observations
amount of matter in an object
how much space an object occupies
boundary between areas of different properties
opposing forces or actions balancing out
occurs when the properties or characteristics of part of the environment change
Perception of some aspects of the environment by one or more human senses.