Subduction Zone: An area at a convergent plate boundary where an oceanic plate is being forced down into the mantle beneath another plate. These can be identified by a zone of progressively deeper earthquakes.

 

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Subduction Zone: An area at a convergent plate boundary where an oceanic plate is being forced down into the mantle beneath another plate. These can be identified by a zone of progressively deeper earthquakes.

Target Heart Rate Zone: The number of heartbeats per minute reflecting the exercise intensity that gains the maximum training benefits from an aerobic workout. The formula for obtaining a target heart rate equals 2 . . . View Full Definition

Surf Zone: An area of breaking waves bounded by the point of first breakers, then landward to the maximum uprush of waves on the beach.

Sunlight Zone: See Photic Zone.

Target Zone Arrangement: In the context of takeovers, the price at which an acquirer aims to buy a target firm. In the context of options, the price of the underlying security at which an option will become in the m . . . View Full Definition

Twilight Zone: See Mesopelagic Zone.

Wrack Zone: A bank of accumulated litter at the strandline

Wash Zone: The depth zone in which sediments are disturbed by wave action near the shoreline

Vadose Zone: The region in the ground between the surface and the water table in which pores are not filled with water. Also called the unsaturated zone.

Strike Zone: Target area on either side of HEADPIN.