A-Horizon: The uppermost layer of a soil, containing organic material and leached minerals.
Pedocal: A common soil type of arid regions, characterized by accumulation of calcium carbonate in the A-horizon.
B-Horizon: The intermediate layer in a soil, situated below the A-horizon and consisting of clays and oxides. Also called the zone of accumulation.
Word of the Day:
Malty: An aromatic sensation created by a moderately volatile set of aldehydes and ketones that produces sensations reminiscent of toasted grains.