spheroidal weathering (onion weathering) The development of concentric shells of normally chemically weathered material in the outer zone of a joint-bounded mass of rock. The spheroidal or onion-skin appearance results from enhanced weathering at joint intersections together with the expansion resulting from chemical change.
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Joint (geology) , joint 1. A discrete brittle fracture in a rock along which there has been little or no movement parallel to the plane of fracture, but slight movemen… Joint , joint / joint/ • n. 1. a point at which parts of an artificial structure are joined. ∎ Geol. a break or fracture in a mass of rock, with no relative… Ball-and-socket Joint , Skip to main content ball-and-socket joint ball-and-socket joint ball-and-socket joint, in engineering, mechanical connection used between parts that… Double-jointed , double-jointed Some individuals are referred to as being ‘double-joined’. In reality these individuals do not have ‘double’ joints, but have a greate… Plants and Animals , coxa Uppermost joint of the leg of an insect, which articulates with the thorax proximally, and with the trochanter distally. The coxa is usually a s… natural remanent magnetism , natural remanent magnetism (NRM) The remanent magnetization of rocks and naturally occurring objects that has been acquired by normal processes, i.e.…
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