erosion time
61Surtsey — featured articleInfobox World Heritage Site WHS = Surtsey State Party = ISL Type = Natural Criteria = ix ID = 1267 Region = Europe and North America Year = 2008 Session = 32nd Extension = Link = http://whc.unesco.org/en/list/1267Surtsey… …
62Sedimentary rock — Middle Triassic marginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwestern Utah, USA Sedimentary rock are types of rock that are formed by the deposition of material at the Earth s surface and within… …
63Crop rotation — Fallow redirects here. For other uses, see Fallow (disambiguation). Satellite image of circular crop fields in late June 2001. Healthy, growing crops are green. Corn would be growing into leafy stalks by then. Sorghum, which resembles corn, grows …
64Great Sphinx of Giza — The Great Sphinx of Giza ( ar. أبو الهول The Father of Fear ) is a half human, half lion Sphinx statue in Egypt, on the Giza Plateau at the west bank of the Nile River, near modern day Cairo. The largest monolith statue in the world, it stands 73 …
65Mathematical morphology — A shape (in blue) and its morphological dilation (in green) and erosion (in yellow) by a diamond shape structuring element. Mathematical morphology (MM) is a theory and technique for the analysis and processing of geometrical structures, based on …
66Geology of the Yosemite area — The exposed geology of the Yosemite area includes primarily granitic rocks with some older metamorphic rock. The first rocks were laid down in Precambrian times, when the area around Yosemite National Park was on the edge of a very young North… …
67New Zealand — New Zealander. /zee leuhnd/ a country in the S Pacific, SE of Australia, consisting of North Island, South Island, and adjacent small islands: a member of the Commonwealth of Nations. 3,587,275; 103,416 sq. mi. (267,845 sq. km). Cap.: Wellington …
68North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …
69metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …
70Aliso Creek (Orange County) — Not to be confused with Aliso Creek (Los Angeles County). Coordinates: 33°30′38″N 117°45′9″W / 33.51056°N 117.7525°W / 33.51056; …
