| 21. | The Pacific states are the most geologically active areas in the United States.
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| 22. | They are called non-Desarguesian projective planes and are an active area of research.
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| 23. | This is a very active area in research and it has grown rapidly.
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| 24. | :You are right that condensed matter physics is an active area of research.
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| 25. | Curriculum-based measurement and curriculum matching is another active area of application.
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| 26. | *Digital Entrepreneurship is an active area for research around the world.
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| 27. | Determining the boundaries between genera within the Scilloideae is an active area of research.
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| 28. | An active area of research is the univalent foundations arising from homotopy type theory.
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| 29. | As of 2006, euthanasia is the most active area of research in contemporary bioethics.
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| 30. | Grain drying is an active area of manufacturing and research.
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