geophysical modification activity
41Space debris — populations seen from outside geosynchronous orbit (GEO). Note the two primary debris fields, the ring of objects in GEO, and the cloud of objects in low earth orbit (LEO) …
42Earth and Space Sciences — ▪ 1996 Introduction GEOLOGY AND GEOCHEMISTRY In 1995 significant developments took place in the realm of geologic mapping, which provides the foundation for the presentation and comparison of data in the Earth sciences. The most important… …
43Geomagnetic storm — This article is about disturbances within Earth s magnetosphere. For other uses of magnetic storm , see Magnetic storm (disambiguation). Solar particles interact with Earth s magnetosphere. A geomagnetic storm is a temporary disturbance of the… …
44Black carbon — or BC is formed through the incomplete combustion of fossil fuels, biofuel, and biomass, and is emitted in both anthropogenic and naturally occurring soot. Black carbon warms the planet by absorbing heat in the atmosphere and by reducing albedo,… …
45Shakespeare quadrangle — The Shakespeare quadrangle is a region of Mercury running from 90 to 180° longitude and 20 to 70° latitude. It is also called Caduceata.Mariner 10 imagingThe only spacecraft images of Mercury are those taken by the Mariner 10 spacecraft, which… …
46Radon — Pour les articles homonymes, voir Radon (homonymie) et Rn. Radon Asta …
47Ecology — For other uses, see Ecology (disambiguation). Ecology …
48USS Triton (SSRN-586) — USS Triton (SSRN/SSN 586), a U.S. Navy nuclear powered radar picket submarine, was the first vessel to execute a submerged circumnavigation of the Earth, accomplishing this during her shakedown cruise in early 1960. She also has the distinction… …
49Olympus Mons — Pour les articles homonymes, voir Olympus. Olympus Mons Mosaïque d images de Viking 1 Orbiter (22 juin  …
50Middle American Indian — ▪ people Introduction member of any of the aboriginal peoples inhabiting the area from northern Mexico to Nicaragua. The physical spine of Middle America is the broad mountain chain extending from the southern end of the Rockies to… …
