KeelyRobinson9-23-10
Terms
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- Photosynthesis
- The process by which some organisms use light energy to make nutrients.
- Physical change
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A change in a substance that does not involve a change in the identy of the substance.
- Physical property
- A characteristic of a substance that can be observed or measured without changing the identy of a substance.
- Pictograph
-
A visual display that uses symbols or pictures to represent a numerical value.
- Plankton
- Tiny organisms that are moved by ocean currents. Baleedn whales eat these.
- Plate tectonics
- The theory stating that the earth is broken into giant chuncks of land or ocean floor that can slowly move. Plate tectonics cause continal drift.
- Point-Source Pollution
- Pollution that comes from a single well identified source.
- Pollutant
- Any substance or form of energy that can cause harm to the enviorment and make it unfit for use by organisms.
- Potency
- Strength or how powerful a chemical is.
- Ppm
- Parts per million. A unit used to express the concentration in a solution.
- Ppb
- Parts per billion. A unit used to express the concentration in a solution.
- Precision
- The consistency of a set of measurments.
- Prediction
- A statement suggesting what might happen in the future based on patterns in data and experiences.
- Pesticides
- Chemicals designed to kill organisms (insects, weeds, rodents) that are concidered pests.
- pH
- The measure of how acidic or basic (alkaline) a substance is. pH stands for " Powers of Hydrogen "