2.




conserved:
1.protect (something, especially an environmentally or culturally important place or thing) from harm or destruction.

2.

  
depth
1.the distance from the top or surface of something to its bottom.

2.



expansion 
1.the action of becoming larger or more extensive.


2.



freezing
1.below 32°F (0°C).

2.


isolated system
1.is either of the following: a physical system so far removed from other systems that it does not interact with them


2.


Law of Conservation of Energy
1.states that the total energy of an isolated system remains constant—it is said to be conserved over time

2.


Light
1.the natural agent that stimulates sight and makes things visible.


2.

medium
1.an agency or means of doing something.

2.


open system
1.

2.



period
1.a length or portion of time.

2.


properties of water

1. A clear, colorless, odorless, and tasteless liquid, H2O, essential for most plant and animal life and the most widely used of all solvents
2.


Property
1.a thing or things belonging to someone; possessions collectively.

2.


reflection
1.the throwing back by a body or surface of light, heat, or sound without absorbing it.

2.


refraction 
1.the fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
2.


solvent
1.having assets in excess of liabilities; able to pay one's debts.
2.


suitability 
1. A situation (and sometimes a legal requirement) that an investment strategy meets the objectives and means of an investor. 
2.


temperature
1.the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
2.


water 
1.a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

2.

waves
1.move one's hand to and fro in greeting or as a signal.
2.




wavelength

2.