RVEC Science Vocabulary Practice
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Created by:
williamsd09 on May 7, 2012
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48 terms
Terms | Definitions |
|---|---|
 Turbidity | A measure of how clear water is |
| pH | A measure of how acidic or basic a substance is. |
| Bio-indicator | Organisms that can exist in water supplies that are used assess ecosystem health. |
| Smoke pollution | Exhaust from cars adds nitrates into the atmosphere that get caught in raindrops. |
| Heat pollution | Hot water flows from a factory into a body of water and raises the temp. |
| Chemical pollution | Fertilizer runoff contaminates rain water runoff. |
| Individual susceptibility | How an organism responds to a particular chemical substance. |
| Dose | Refers to the amount of a chemical substance that is introduced into an organism. |
| Potency | Refers to how powerful and strong a chemical is. |
| Non-point source pollution | Pollution that comes from a wide area rather than a specific source, like a farm or parking lot. |
| Point-source pollution | Pollution that comes from a specific source, like a drain pipe or factory. |
| Density formula | D=m/v |
| Sonar | Uses sound waves to measure the depth of the ocean floor |
| Aquifer | A rock layer that stores water and allows water to flow through it. |
| Respiration | Ocean and land animals use this process to get energy, using oxygen and giving off carbon dioxide |
| Cohesion | The tendency of a water molecule to stick to other water molecules |
| Universal Solvent | Ability to dissolve many substances. |
| Surface tension | Tightness across the surface of water that is caused by polar molecules pulling on each other. |
| Impermeable rock | A rock layer that does not allow water to flow through it because of pores that are too small. |
| Age of earth | 4.6 Billion |
| Eon | Longest division of geologic time, measured in billions of years. |
| Bottom | Where in rock layers you would find the oldest fossils. |
| Fossil | The remains or traces of a living thing that has been preserved in rock. |
| Absolute age | The exact age of a fossil or rock layer in years. |
| Relative age | The age of a fossil or rock layer compared to the objects around it. |
| Transform boundary | When two tectonic plates grind past each other. |
| Divergent boundary | When two tectonic plates move away from each other. |
| Convergent boundary | When two tectonic plates move toward each other. |
| Mechanical weathering | The breaking down of rocks without changing the chemical composition of the rock. |
| Chemical weathering | The breaking down of rocks involving a change in the chemical composition of the rock. |
| Fossil record | The biological history of an area as recorded by fossils found in the area. |
| Puzzle evidence | Evidence for continental drift that lines up the coastlines of different continents showing they once fit together. |
| Pangaea | The supercontinent that began breaking up 200 million years ago. |
| Fossil evidence | The discovery of fossils on different continents when the organisms could not have traveled the ocean. |
| Geologic evidence | The discovery of rock features on different continents that suggest the continents once fit together. |
| Climatic evidence | Example: the discovery of glacier remains on a tropical continent. |
| Chemical change | When a chemical reaction changes the substance an object is made of. Ex. rusting. |
| Ductile | The ability of a substance to be pulled into a wire without breaking. Ex: most metals. |
| Malleable | The ability of a substance to be flattened into sheets without breaking. Ex. aluminum foil. |
| Physical change | A change in a substance that does not change the composition of the substance. Ex. food coloring in icing. |
| Endothermic | A chemical reaction that absorbs heat. |
| Exothermic | A chemical reaction that gives off heat. |
| Atom | The basic building blocks of all matter. |
| Cells | All living things are made of these. |
| Proton | The positively charged particle in the nucleus of an atom. |
| Electron | The particle that orbits around the nucleus and contains a negative charge. |
| Neutron | The particle in the nucleus of an atom that contains no charge. |
| Chemical | any substance that has a definite composition |
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