substrate topography
21River — For other uses, see River (disambiguation). The Tigris River near Hasankeyf, in southeastern Turkey …
22building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
23Alpine tundra — Hikers traversing the Franconia Ridge in the White Mountains, much of which is in the alpine zone. Alpine tundra is a natural region that does not contain trees because it is at high altitude. Alpine tundra is distinguished from arctic tundra,… …
24Sonar — This article is about underwater sound propagation. For atmospheric sounding, see SODAR. For other uses, see Sonar (disambiguation) …
25Soil — For other uses, see Soil (disambiguation). A represents soil; B represents laterite, a regolith; C represents saprolite, a less weathered regolith; the bottommost layer represents bedrock …
26Bird nest — For animal nests in general, see Nest. For other uses, see Bird s nest. Deep cup nest of the Great Reed warbler A bird nest is the spot in which a bird lays and incubates its eggs and raises its young. Although the term popularly refers to a… …
27Loricariidae — Temporal range: Upper Miocene Recent[1] Pterygoplichthys sp. S …
28Primate basal ganglia system — The primate basal ganglia system is a symmetrical major cerebral system that has only recently been recognized. In the past, part of it was presented as motor or extrapyramidal , complementary to the corticospinal (pyramidal) system. Contrary to… …
29Marine larval ecology — is the study of the factors influencing the dispersing larval stage exhibited by many marine invertebrates and fishes. Marine organisms with a larval stage usually release large numbers of larvae into the water column, where these larvae develop… …
30Nanometrology — NIST Next Generation Nanometrology research.[1] Nanometrology is a subfield of metrology, concerned with the science of measurement at the nanoscale level. Nanometrology has a crucial role in order to produce nanomaterials and devices w …
