Science Fair Project Encyclopedia
In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. See also: embryogenesis.
In mineralogy, the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types:
- Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
- Cubic cleavage: cleavage parallel to the faces of a cube.
- Diagonal cleavage: cleavage parallel to a diagonal plane.
- Lateral cleavage: cleavage parallel to the lateral planes.
- Octahedral, Dodecahedral, or Rhombohedral cleavage: cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron .
- Prismatic cleavage, cleavage parallel to a vertical Prism.
See crystal structure.
In general use, the separation between a woman's breasts, or any line formed by a groove between two parts.
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