Hydrothermal Activity: Any process involving high-temperature groundwaters, especially the alteration and emplacement of minerals and the formation of hot springs and geysers.

 

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Hydrothermal Activity: Any process involving high-temperature groundwaters, especially the alteration and emplacement of minerals and the formation of hot springs and geysers.

Optical Activity: A substance that is capable of rotating plane-polarized light. Molecules of an optically active substance cannot be superimposed on their own mirror images, just as your left hand cannot be . . . View Full Definition

Interactivity: If your web site isn't interactive, it's dead.

Life Activity: For purposes of Section 503 of the Rehabilitation Act and ADA, functions that are limited by a person's disability such as caring for oneself, performing manual tasks, walking, seeing, heari . . . View Full Definition

Passive Activity Loss (PAL): A loss incurred in participating in passive investing.

Weekly Activity Report: A weekly written report given to an owner by a listing broker reviewing the sales activities conducted by the broker to sell the listed property.

Radioactivity: Spontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms. 'Radiation' refers to the emissions, and 'radioactive source' refers to the sour . . . View Full Definition

Quantitative Structure-Activity Relationship: A mathematical connection between chemical structure and biological activity, established by statistical analysis or pattern recognition techniques.

Hydrothermal Vents: Sites in the deep ocean floor where hot, sulfur-rich water is released from geothermally heated rock

Hydrothermal Vein: A deposit of minerals precipitated in a fracture by the actions of hot water or gases associated with a magmatic source.