compacted soil
21Mesoamerican ballcourt — Ceramic sculpture from a Western Mexican tomb showing players engaged in the Mesoamerican ballgame. A Mesoamerican ballcourt is a large masonry structure of a type used in Mesoamerica for over 2,700 years to play the Mesoamerican ballgame,… …
22Pile bridge — A pile bridge is a structure that uses foundations consisting of long poles (referred to as piles), which are made of wood, concrete or steel and which are hammered into the soft soils beneath the bridge until the end of the pile reaches a hard… …
23Noronhia emarginata — Scientific classification Kingdom: Plantae (unranked) …
24Rhus copallina — taxobox name = Rhus copallina regnum = Plantae unranked divisio = Angiosperms unranked classis = Eudicots unranked ordo = Rosids ordo = Sapindales familia = Anacardiaceae genus = Rhus species = R. copallina binomial = Rhus copallina binomial… …
25Mole (disambiguation) — Mole may refer to:Animals* Mole or mouldywarp, any of the burrowing insectivorous mammals in the family Talpidae, with short velvety fur and enlarged front limbs; the original burrowing mole * Golden mole, any of the burrowing insectivorous… …
26Acer triflorum — taxobox name = Acer triflorum regnum = Plantae unranked divisio = Angiosperms unranked classis = Eudicots unranked ordo = Rosids ordo = Sapindales familia = Sapindaceae genus = Acer species = A. triflorum binomial = Acer triflorum binomial… …
27Hydraulic fill — A hydraulic fill is an embankment or other fill in which the materials are deposited in place by a flowing stream of water, with the deposition being selective. Gravity, coupled with velocity control, is used to effect the selected deposition of… …
28Matricaria discoidea — Pineappleweed Scientific classification Kingdom: Plantae …
29Patowmack Canal — The Patowmack Canal is an inoperative canal located in Virginia, United States, that was designed to bypass rapids in the Potomac River upstream of the present Washington, D.C. area. The Canal is managed by the National Park Service as it is… …
30Royal Observer Corps — Ensign Active 1925–1996 Country …
