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MSA Review P-R

MSA Review Vocabulary P-R

Parallel circuit: Electrical circuit arranged so that current passes through more than one pathway simultaneously.
Parasite: A symbiotic relationship between two organisms in which one (the parasite) benefits to the detriment of the other (host).
Pathogen: An agent (usually a microorganism) that causes a disease.
Pattern: Repeated sequences of natural occurrences. A configuration of shapes or other objects arranged in such a way as to demonstrate a specific repeat in design.
Periodic table: A chart where all elements are organized into periods and groups according to their properties.
Petrified: Fossilized remains that have been turned into stone.
pH scale: Scale ranging from 0-14, used to describe how acidic (0) or basic (14) a substance is. The pH is the measure of the hydrogen ion concentration in a solution.
Phases (lunar): The regularly occurring cycle of changes in the appearance of the moon.
Photosynthesis: The process by which green plants use water and carbon dioxide and light from the sun to make food.
Physical change: A change that occurs in the physical property/properties of a substance without altering its composition.
Physical properties: Any property of matter that can be observed by your senses.
Pitch: How high or low sound frequencies appear to be.
Planet: A major body (not a comet or asteroid) orbiting around a star.
Plate tectonics: Large crustal plates moving on the Earth's surface and resulting in changes in the Earth's surface.
Pollution: Human and natural contamination of the environment by chemicals or heat energy to the extent that existing habitats are threatened or populations of organisms are endangered.
Population: A group of organisms of the same species that live in the same area at the same time.
Potential energy: The stored energy of a body because of its position.
Precipitation: Process by which water falls to Earth from the atmosphere in the form of rain, snow, sleet, or hail.
Predator: An organism that kills and consumes another organism (prey); includes animals eating other animals, and animals eating plants.
Prediction: A broad statement (based on an observation, experience, or scientific reason) of what will happen (the effect) in a given circumstance or situation.
Prey: An organism that is killed and eaten by another organism.
Producer: An organism that makes its own food.
Proton: Positively charged particles in the nucleus of an atom.
Psychrometer: An instrument used to measure relative humidity
Qualitative: Data that is related to the quality of observations.
Radiation: Energy traveling through empty space or through a transparent material without heating the empty space or transparent material.
Reactant: Compound or element that changes during a chemical reaction.
Reactivity: Ability of an element to gain or lose electrons which are used for bonding.
Refraction: The change in velocity and apparent bending of the beam of light or other wave-form as it passes from one medium into another.
Relative age: The age of a rock (older or younger) in comparison with the age of other rocks.
Renewable resource: Resources that can be replenished, such as trees and plants.
Revolution: The movement of a celestial body in an orbit around another celestial body.
River: A natural stream of water with a large volume.
Rock slide: A mass of rock sliding down a hill or mountainside.
Rotation: The spinning motion of a planet or other object on its axis.
Created by: wknopf