physical change - a change in a substance that does not involve a change in the identity of the substance, chemical change - a change that occurs when one or more substances change into entirely new substances with different properties, compund - a pure substance that forms when two or more elements join chemically in a fixed proportion, chemical property - a characteristic of a substance that cannot be observed without changing the identity of the substance, physical property - a characteristic of a substance that can be observed directly (what you see, what you feel, what you smell) or can be measured with a tool without changing the identity of the substance, mixture - matter made up of two or more substances that are not joined chemically, pandemic  - an epidemic that spreads over a large area, or throughout the world, epidemic - an outbreak of a disease that affects many people in an area, icecores - a cylinder of ice removed from an ice sheet (glacier) that helps scientists understand past CLIMATES and how ATMOSPHERIC conditions have changed over time, pure substance - matter that has the same chemical composition throughout and cannot be separated into its parts by physical means; examples: elements and compounds, competition  - the struggle between individuals of the same or different species for food, space, light, etc., adaptation - a trait that helps an organism survive in a particular environment, vector - animal that carries pathogens from person to person, carrier - a person who has some pathogen to which he is immune but who can pass it on to others, parasite - an organism that lives on or in a host and causes it harm, unicellular - having only one cell, cell theory - states that all organisms are made up of one or more cells, the cell is the basic unit of life, and all cells come from other cells, evolution - gradual change over time, index fossil - fossils of widely distributed organisms that lived during only one short period, reactivity - the ability of a substance to combine chemically with another substance,

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