Question

figure 1. cave of crystals (left) and gypsum sand at white sands np (right). which two abiotic factors must be present in order for gypsum to form? water salt nitrates heat wind

Explanation:

Gypsum forms when calcium - sulfate dihydrate precipitates from water. Also, heat can facilitate the evaporation process which helps in crystal formation. Water provides the medium for the chemical reaction and transport of ions, and heat aids in the evaporation and crystallization.

Answer:

water, heat