bed silt
51Marcellus Formation — Stratigraphic range: Middle Devonian …
52Beaver — Taxobox name = Beavers fossil range = Late Miocene – Recent image caption = American Beaver image width = 300px regnum = Animalia phylum = Chordata classis = Mammalia ordo = Rodentia familia = Castoridae genus = Castor genus authority = Linnaeus …
53İzmir — Infobox Settlement settlement type = subdivision type = Country subdivision name = TUR timezone=EET utc offset=+2 map caption =Location of İzmir within Turkey. timezone DST=EEST utc offset DST=+3 official name = İzmir image caption = Port of… …
54Mima mounds — Coordinates: 46°53′55″N 123°03′02″W / 46.8985602°N 123.0504799°W / 46.8985602; 123.0504799 Mima mounds ( …
55Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …
56GEOGRAPHICAL SURVEY — Names The name Ereẓ Israel (the Land of Israel) designates the land which, according to the Bible was promised as an inheritance to the Israelite tribes. In the course of time it came to be regarded first by the Jews and then also by the… …
57Geography of China — Topography of China. Longsheng Rice Terrac …
58Floodplain — | | [ Virgin River at the upper end of Zion Canyon, Zion National Park, Utah, has almost no floodplain at all.] | | | | |A floodplain, or flood plain, is flat or nearly flat land adjacent to a stream or river that experiences occasional or… …
59Coral reef — Marine habitats Biodiversity of a coral reef Lit …
60Gravel — For other uses, see Gravel (disambiguation). Gravel (largest fragment in this photo is about 4 cm) …
