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  2. Border - Wikipedia

    en.wikipedia.org/wiki/Border

    A relic border is a former boundary, which may no longer be a legal boundary at all. However, the former presence of the boundary can still be seen in the landscape. For instance, the boundary between East and West Germany is no longer an international boundary, but it can still be seen because of historical markers on the landscape; it remains ...

  3. AP Human Geography - Wikipedia

    en.wikipedia.org/wiki/AP_Human_Geography

    Advanced Placement (AP) Human Geography (also known as AP Human Geo, AP Geography, APHG, AP HuGe, APHug, AP Human, HuGS, AP HuGo, or HGAP) is an Advanced Placement social studies course in human geography for high school, usually freshmen students in the US, culminating in an exam administered by the College Board.

  4. Metes and bounds - Wikipedia

    en.wikipedia.org/wiki/Metes_and_bounds

    Metes and bounds is a system or method of describing land, real property (in contrast to personal property) or real estate. [1] The system has been used in England for many centuries and is still used there in the definition of general boundaries.

  5. Human geography - Wikipedia

    en.wikipedia.org/wiki/Human_geography

    Original mapping by John Snow showing the clusters of cholera cases in the London epidemic of 1854, which is a classical case of using human geography. Human geography or anthropogeography is the branch of geography which studies spatial relationships between human communities, cultures, economies, and their interactions with the environment, examples of which include urban sprawl and urban ...

  6. Type 1 and type 2 sequence - Wikipedia

    en.wikipedia.org/wiki/Type_1_and_type_2_sequence

    The definition of a type 1 and type 2 sequence was first introduced by Vail et al. (1984). [4] Since they were hard to recognize, they were redefined in 1990 by Van Wagoner et al.. However even with this new definition, type 2 sequence boundaries were hard to recognize in the field due to their lack of subaerial exposure.

  7. Relict (biology) - Wikipedia

    en.wikipedia.org/wiki/Relict_(biology)

    Definition. A relict (or relic) plant or animal is a taxon that persists as a remnant of what was once a diverse and widespread population. Relictualism occurs when a ...

  8. State shapes - Wikipedia

    en.wikipedia.org/wiki/State_shapes

    The shape of a state is determined by the political boundaries and geography that determine its territory, and that shape impacts the politics and economies of the state. [1] The six categories of state shapes are: compact; elongated or attenuated; fragmented; prorupted or protruded; perforated; and compound or complex. [2] [3] [4]

  9. Singular homology - Wikipedia

    en.wikipedia.org/wiki/Singular_homology

    Example of singular 1-chains: The violet and orange 1-chains cannot be realized as a boundary of a 2-chain. The usual construction of singular homology proceeds by defining formal sums of simplices, which may be understood to be elements of a free abelian group, and then showing that we can define a certain group, the homology group of the topological space, involving the boundary operator.