| Term | Definition |
| amplitude | The distance between the highest and lowest point of a wave |
| classification | The grouping of things into categories based on similiar characteristics |
| commensalism | Two organisms living together when one is benefited and the other is not harmed |
| consumer | An organism that gets its energy/nutrition from another organism |
| decomposer | An organism that eats dead organisms causing the material in the dead organism to be broken down |
| solar eclipse | occurs when the Moon passes between the Sun and the Earth so that the Sun |
| lunar eclipse | occurs when the Earth, Sun, and Moon are aligned with the Earth in the middle |
| energy transformations | changing from one form of energy to another |
| extinction | no longer in existance |
| food web | all feeding relationships of organisms in an ecosystem |
| fossils | preserved remains of organisms that lived in the past |
| frequency | the number of waves within a given time period |
| heat flow | movement from a hotter body to a colder body |
| mutualism | two organisms living together and both benefit from each other |
| nuclear power | energy from a nuclear reaction |
| parasitism | two organisms living together and one is benefited and the other is harmed |
| producer | an organism that created food |
| reflection | the changing of the direction of light due to hitting another surface |
| refraction | The bending of a light ray when passing through different surfaces |
| relative age | the approximate age of a fossil by comparing to surrounding rock layers |
| season | winter, spring, fall, and summer |
| sedimentary rocks | rocks formed in water by fragment of other rocks, debris, shells, etc |
| tides | rising and lowering of the oceans due to reactions with the Sun and Moon |
| wavelength | distance from one peak to the next peak on a wave |