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  • Thumbnail for Cretaceous–Paleogene extinction event
    sediment called the K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually...
    200 KB (21,690 words) - 21:06, 14 September 2024
  • Thumbnail for Outer space
    physical boundary, with the air pressure steadily decreasing with altitude until it mixes with the solar wind. Various definitions for a practical boundary have...
    136 KB (13,431 words) - 10:10, 6 September 2024
  • Thumbnail for Jurassic
    the Jurassic, however, has no clear, definitive boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined...
    231 KB (24,898 words) - 17:27, 30 August 2024
  • Thumbnail for Cretaceous
    of Pterosauria at the Cretaceous-Paleogene boundary". PLOS Biology. 16 (3): e2001663. doi:10.1371/journal.pbio.2001663. ISSN 1545-7885. PMC 5849296. PMID 29534059...
    95 KB (9,854 words) - 11:04, 11 September 2024
  • Thumbnail for Convergent boundary
    A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides...
    20 KB (2,374 words) - 13:33, 16 September 2024
  • Thumbnail for Permian–Triassic extinction event
    Permian–Triassic boundary microbialites: A discussion of microbial and ocean processes after the end-Permian mass extinction". Journal of Palaeogeography...
    365 KB (39,165 words) - 02:55, 16 September 2024
  • Thumbnail for British Guiana
    173-191. Schoenrich, Otto. "The Venezuela-British Guiana Boundary Dispute." American Journal of International Law 43.3 (1949): 523-530. online Spinner...
    27 KB (3,079 words) - 20:58, 9 September 2024
  • Thumbnail for Late Cretaceous
    in various parts of the world, known as the Cretaceous–Paleogene boundary (K–T boundary). K is the traditional abbreviation for the Cretaceous Period derived...
    18 KB (1,693 words) - 09:02, 22 August 2024
  • Thumbnail for Plate tectonics
    Where the plates meet, their relative motion determines the type of plate boundary (or fault): convergent, divergent, or transform. The relative movement...
    113 KB (13,666 words) - 14:46, 3 September 2024
  • Thumbnail for Canada–United States border
    border is the longest international border in the world. The boundary (including boundaries in the Great Lakes, Atlantic, and Pacific coasts) is 8,891 km...
    82 KB (8,891 words) - 13:32, 12 September 2024
  • Thumbnail for Asthenosphere
    (2011). "Imaging the lithosphere-asthenosphere boundary beneath the Pacific using SS waveform modeling". Journal of Geophysical Research: Solid Earth. 116...
    18 KB (2,128 words) - 13:34, 13 August 2024
  • Thumbnail for Cambrian
    Ediacaran and early Cambrian led to the development of new convergent plate boundaries and continental-margin arc magmatism along its margins that helped drive...
    86 KB (9,075 words) - 08:58, 13 September 2024
  • in its effective presence. The philosopher Jack A. Wilson examines some boundary cases to demonstrate that the concept of organism is not sharply defined...
    25 KB (2,323 words) - 15:29, 12 September 2024
  • Thumbnail for Subduction
    continental lithosphere is recycled into the Earth's mantle at the convergent boundaries between tectonic plates. Where one tectonic plate converges with a second...
    67 KB (8,251 words) - 14:22, 3 September 2024
  • Thumbnail for Möbius strip
    other spaces, the Möbius strip may have two sides. It has only a single boundary curve. Several geometric constructions of the Möbius strip provide it with...
    88 KB (9,611 words) - 15:13, 22 August 2024
  • Thumbnail for Cretaceous–Paleogene boundary
    The Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K–T) boundary, is a geological signature, usually a thin band of rock...
    28 KB (3,034 words) - 16:42, 17 August 2024
  • Thumbnail for Ocean gyre
    return flow on the western boundary (western boundary current) and one with the return flow on the eastern boundary (eastern boundary current). A qualitative...
    63 KB (8,050 words) - 14:51, 28 August 2024
  • Thumbnail for Paleocene
    of Pterosauria at the Cretaceous-Paleogene boundary". PLOS Biology. 16 (3): e2001663. doi:10.1371/journal.pbio.2001663. PMC 5849296. PMID 29534059. Mayr...
    154 KB (17,377 words) - 16:56, 16 September 2024
  • Thumbnail for Boundary layer
    In physics and fluid mechanics, a boundary layer is the thin layer of fluid in the immediate vicinity of a bounding surface formed by the fluid flowing...
    49 KB (7,678 words) - 05:32, 19 July 2024
  • Thumbnail for Caribbean Plate
    complex transition from the subduction boundary to the south and the transform boundary to the west. The eastern boundary is a subduction zone, the Lesser Antilles...
    14 KB (1,419 words) - 02:47, 29 January 2024
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