Is craving dirt possibly anemia?

Yes: Craving dirt, or many other crunchy materials (ice, starch, etc) is called "pica" and may be a sign of iron deficiency. There is no known explanation for this but it has been postulated that our ancient or prehistoric forefathers might have corrected severe iron deficiency by getting iron out of eating iron-containing dirt or pebbles.

PICA: The most common cause of anemia is iron deficiency usually from chronic blood loss (heavy menstrual periods in women or unsuspected bleeding from the stomach or colon). Iron deficiency seems to induce a craving in the diet for something that resembles metallic qualities of iron (hardness, taste or color) - ice cubes or chips, hard candy, or even inedible things like dirt. This is called pica.