Definitions for "Transition zone"
the region of the mantle at depths between 400 and 670 km where the seismic velocities rise continuously from the upper to the lower mantle regions.
The middle portion of the mantle, from 400 to 670 km deep, in which there are several jumps in seismic velocity.
The seismic discontinuity located in the upper mantle just beneath the asthenosphere and characterized by a marked increase in the velocity of seismic waves.
The zone lying between the Boreal and Sonoran zones of North America. It includes an eastern or humid subdivision and a western arid one of corresponding temperature comprising the northern Great Plains and the lower slopes of the mountains of the western United States and Mexico. Called also Neutral zone.
see Zone in Transition.
an area where the wells produce both free oil and free gas
an area where environmental conditions change gradually and natural communities overlap.
The area of progressive eyeglass lenses where the distance vision curve gradually changes into the near-vision curve.
An area linking two series of sediments formed in contrasting environments.
The region of rapid temperature increase that separates the Sun's chromosphere from the corona.
the region between land and deep water consisting typically of surf, swamps, and bayous.