Related Words

Convergent Plate Boundary: The boundary between two plates that are moving toward one another.

Plateau Basalt: A sequence of parallel to subparallel basalt flows that were formed during a geologically brief interval of time and which covered an extensive geographic area. Thought to have formed from s . . . View Full Definition

Platelets: In vertebrates, cell fragments that bud off from the megakaryocytes in the bone marrow; carry chemicals needed for blood clotting. Cell fragment functioning in blood clotting.

Plates: Early photographic glass plates coated with emulsion.

Schumann Plate: Plate coated with an emulsion with so little gelatin content that the silver halide grains protrude above its surface. Used for photography in the ultraviolet region.

Quarterplate: Negative or print format measuring 3 ¼ x 4 ¼ inches. It's one quarter the size of a full plate (8 ½ x 6 ½ inches).

Plate Tectonics: The movement of the plates that make up the surface of the Earth. The revolutionary paradigm in geology that the earths crust is composed of rigid segments (plates) in constant (although con . . . View Full Definition

Plate Camera: Camera designed to take glass plates but often adapted to take cut film.

Parallel Plate Intake: Intake of a stilling or protective well with two parallel plates attached below. The plates are typically three times the diameter of the well and are spaced three inches apart. The plates a . . . View Full Definition

Phase Boundary: A phase boundary is a surface where two samples of matter with different properties are in contact. The surface of a gas bubble in water or the surface of a crystal are examples of phase boundaries.