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GENR-91; Short Answer: Used primarily in fertilizers, which element is never found free in nature even though it makes up about 2.5% of the earth's crust? ANSWER: POTASSIUM GENR-91; Short Answer: What element, whose symbol derived from the Latin for "liquid silver", has been found in Egyptian tombs from 1500 B.C.? ANSWER: MERCURY Chapter 5 How Ecosystems Work PowerPoint Chapter 5 Lecture Guide What's For Dinner Worksheet Ecological Pyramids Activity Cycling of Materials WebQuest Cycling of Materials Coloring and Questions Pages Chapter 5 Study Guide 1. Vocabulary Study. Plate tectonics – the idea of giant plates of rock moving slowly across Earth’s surface. Fossil- the physical remains or trace of a plant or animal that lived long ago. Faults- cracks in Earth’s crust along which movement takes place. Seismic waves- shock waves of energy sent out as the crust shakes.