heat and pressure
breaking or creating molecular bonds -- increasing or decreasing heat energy
Light
All matter has mass and volume.
Two types of changes in matter are physical changes and chemical changes. Physical changes involve a change in appearance, such as a change in shape or state, without forming new substances. Chemical changes involve a rearrangement of atoms to form new substances with different chemical properties.
I would suggest temperature and pressure.
A low birth rate and environmental hazards are two things that can cause a population to decrease.
A low Birth Rate and environmental hazards are two things that can cause a population to decrease.
All things should fall into the following two categories: Matter and not-matter. Anything physical (eg. a rock) is made of matter, anything spiritual, relationship orientated or arsey science suggestion is not-matter.
The question is too ambiguous to answer. You may as well ask "what two things can cause error in geography"?
nothing
The Law of Conservation of Mass. & The Law of Conservation of Energy.
Physical changeschemical changesYou must understand that matter can be in any one of three PHYSICAL states, liquid, solid or vapor ( a gas ).Changing physical states is not a chemical change, but a direct result of heat or cold application.