| A | B |
|---|
| observation | the use of your senses to identify and gather information. |
| classify | to organize into groups |
| interface | a boundary between two things |
| inference | guess based on observations |
| lithosphere | the solid rock layer of the earth (land) |
| atmosphere | the gas layers surrounding the Earth |
| hydrosphere | the liquid layer of the Earth |
| mass | how much matter(stuff) an object has |
| volume | how much space an object takes up |
| measurement | describing an observation using numbers and units |
| percent error | how wrong you are |
| density | how packed together an object's molecules are |
| troposphere | the densest layer of the atmosphere |
| stratosphere | the layer of atmosphere above the troposphere |
| pollution | when any substance reaches a harmful level |
| equilibrium | when two objects of forces are in balance |
| cyclic | an up and down repeating pattern of events |
