West Earth History 8.E.2 Copy Crossword
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Down:
1) Rocks that are subjected to high heat and pressure which causes a profound change in form2) Formed when an object is placed into soft mud and is removed by decomposition or physical sources3) The true age of a rock or fossil4) The theory that major changes in the earth's crust result from sudden catastrophes, such as the impact of a large meteor, rather than from gradual evolutionary processes.5) The rate of decay of unstable isotopes can be used to estimate the absolute ages of fossils and rocks10) One of the three main rock types and formed through the cooling and solidification of magma or lava11) “Turned to stone”, a fossil in which minerals replace all or some of an organism. |
Across:
6) The remains of plants, animals and other organisms are converted into a carbon or carbon-containing residue7) Formed when a mold fossil fills up with sediment; three dimensional8) Atoms of the same element that have the same number of protons but different numbers of neutrons9) A plant, animal or other organism that is perfectly preserved for many years12) A continuous process by which rocks are created, changed from one form to another, destroyed, and then formed again.13) the concept that the earth's surface was shaped in the past by gradual processes, such as erosion, and by small sudden changes, such as earthquakes, like the processes we see today rather than by sudden catastrophic acts14) The time taken for the radioactivity of a specified isotope to fall to half its original value15) Evidence of plants, animals, and other organisms in the form of preserved footprints, tracks, burrows, borings, and feces left behind rather than the actual organism’s remains16) Rock that has formed through the deposition and solidification of material, especially material transported by water |
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