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Vocab #9
8th grade vocab
Question | Answer |
---|---|
Physical properties | characteristics like hardness, luster, color, texture, density, and the way it splits. |
Chemical properties | characteristics like the ability to burn and the reactivity to acids. |
Minerals | Natural, sold materials found on Earth that are the building blocks of rock; each has a certain chemical makeup and set of properties that determines their use and value. |
Ores | minerals that are mined because they contain useful metals or nonmetals. |
Fossil fuels | natural fuels that come from the remains of living things; fuels give off energy when they are burned. |
Rocks | materials from earth that can be classified by their physical appearance. Each of 2 classifications is formed differently and can change, over time, from one type to another. |
Trial | Each set of repeated data in an experiment |
Sample | a portion of the total number of objects. It is used in estimation. |
Mold fossil | fossil that forms when sediments bury an organism and the sediments change into rock. The organism decays, leaving a cavity (hollow spot) in the shape of the organism. |
Cast fossil | fossil that forms when a mold is filled with sand or mud that hardens into the shape of the organism. |