Aerial - existing or living or growing or operating in the air. Is characterized by lightness and insubstantiality; as impalpable or intangible as air.
Acute Toxicity
Acute Toxicity: when toxic substances are harmful shortly after exposure.
Adaptation
Adaptation: Taking actions to avoid, benefit from, or deal with current and future climate change. Adaptation can take place in advance (by planning before an impact occurs) or in response to changes that are already occurring.
Acid Rain
Acid Rain – precipitation that is more acidic than normal.
Abyssal
Abyssal – relating to ocean depths from 2000 to 5000 meters. Resembling an abyss in depth; so deep as to be unmeasurable.
Abundance
Abundance- the property of a more than adequate quantity or supply.