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This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic ...
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 ...
With a mass of approximately 1.95 grams (0.069 oz) and a length of 5.5 centimetres (2.2 inches), the bee hummingbird (Mellisuga helenae) is the smallest known dinosaur as well as the smallest bird species, and the smallest warm-blooded vertebrate. Called the zunzuncito in its native habitat on Cuba, it is lighter than a Canadian or U.S. penny.
about 7 μm – diameter of human red blood cells [88] 3–8 μm – width of strand of spider web silk [89] 5–10 μm – width of a chloroplast [90] 8–11 μm – size of a ground-level fog or mist droplet [91] [note 4] 7–12 μm – the diameter of human white blood cells; 8–10 μm – the diameter of human macrophages
The cells in the human body are not outnumbered 10 to 1 by microorganisms. The 10 to 1 ratio was an estimate made in 1972; current estimates put the ratio at either 3 to 1 or 1.3 to 1. [301] The total length of capillaries in the human body is not 100,000 km.
At the birth of the 19th century, Alexander von Humboldt, known as the "founder of plant geography", [4] developed the concept of physique generale to demonstrate the unity of science and how species fit together. As one of the first to contribute empirical data to the science of biogeography through his travel as an explorer, he observed ...
The strong force overpowers the electrostatic repulsion of protons and quarks in nuclei and hadrons respectively, at their respective scales. While quarks are bound in hadrons by the fundamental strong interaction, which is mediated by gluons, nucleons are bound by an emergent phenomenon termed the residual strong force or nuclear force .
[4] [25] Human geography largely focuses on the built environment and how humans create, view, manage, and influence space. [25] Physical geography examines the natural environment and how organisms, climate, soil, water, and landforms produce and interact. [26] The difference between these approaches led to the development of integrated ...