| A | B |
|---|
| Atom | The smallest particle of an element |
| Atomic Mass | The number of protons & neutrons in an atom |
| Atmosphere | Band of gases surrounding the Earth. |
| Atomic Number | The number of protons in the nucleus of an atom. |
| Axis | The imaginary line running through the center of the Earth around which the Earth rotates. |
| Seasons | Caused by tilt of the Earth. |
| Carbon Cycle | Carbon dioxide is absorbed by plants, and released by animals, decomposers, and the burning of fossil fuels. |
| Cell | The smallest basic unit of all living things. |
| Cell Membrane | The membrane that holds cells together. |
| Cell Theory | All living things are made of cells, which come from other cells |
| Cell Wall | Wall around the cell membrane of a plant cell, providing structure and support. |
| Chemical Change | A change in a substance, resulting in a new substance. |
| Chemical Equation | A chemical equation represents a chemical reaction. |
| Chemical Property | Ability of a substance to react with other substances. |
| Chemical Reaction | A process that involves rearrangement of the atoms of one or more substances. |
| Chromosome | A threadlike structure in the cell nucleus carrying genetic information in DNA. |
| Bacteria | A unicellular microorganism that lacks a nucleus |
| Circulatory System | System of human body made up of heart, blood vessels, and blood. |
| Climate | The average weather conditions of a place over a period of years. |
| Community | All the different species of organisms living in a defined area. |
| Compound | A substance formed from two or more elements chemically combined in fixed proportions. |
| Conservation of Mass | Matter cannot be created or destroyed. |
| Consumer | A living organism that lives by eating other organisms. |
| Control | Is used as a basis of comparison for checking the results of an experiment. |
| Crust | The thin outer shell of Earth, made of rock. |
| Cycle | A process in which the last step begins the process all over again, such as the water cycle. |
| Cytoplasm | Th main material of a cell, inside the cell membrane but outside the nucleus; consists of fluid (cytosol) and structures. |
| Data | Facts collected during an experiment or observed in nature. |
| Decomposers | Organisms, such as bacteria & fungi, that break down dead organisms. |
| Dependent Variable | Something whose quantity changes as the result of a change made to the independent variable in an experiment. |
| DNA | A complex molecule that contains the genetic code and transmits heredity in all living organisms. |
| Dominant Trait | A trait, which if present in either gene of the parents, will appear in the individual; therefore, it overrides recessive traits. |
| Ecological Succession | Different organisms that arise in an area, creating a series of different ecosystems, one after the other, often after a catastrophic event. |
| Ecosystem | An ecological system: a community of organisms and their environment. |
| Electricity | A form of energy resulting from the flow of negatively charged particles (electrons). |
| Electron | A subatomic particle with a negative electrical charge and almost no mass; it moves around the nucleus. |
| Element | A substance with atoms of only one kind of atom. |
| Endangered Species | A species close to extinction. |
| Energy | The ability to do work. |
| Equilibrium | A state in which different forces are balanced. |
| Experiment | An attempt to test a hypothesis by gathering data under controlled conditions. |
| Extinction | When the last member of a species dies. |
