Agribusiness: one that markets farm products and equipment, including warehousing, seed monopolization, and fertilizer.

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Dicots have two cotyledons, four- or five-part flowers, and net leaf vein patterns.

Monocots include grasses, orchids, palms, and cattails, and dicots include oaks, sycamores, and maples.

Angle of Repose: the steepest angle that slope, rock, or detritus material settles into without toppling.

Builders of flood-prone roads and sliding hillside homes in California ignore the angle of repose so often that it could be renamed the angle of depose.

Agriculture: large-scale cultivation of the land, with resulting specialization of labor, domestication of plants and animals, identification with one’s sedentery social group, and a radical separation from the natural world.

The Agricultural (Neolithic) Revolution began ten thousand years ago in the Fertile Crescent, where extensive irrigation turned once-fertile croplands into barren salt pans.

The Mandelbrot set of numbers reveals a secret code that went undiscovered for thousands of years.

While mathematicians can plot this set by hand, today’s computers show with great precision the beauty God built into numbers.

Abandoned Wells: a hazard because wells left on vacated lands can channel water contaminated by pesticides and fertilizer straight down into the water table. Abrasion: the wearing away of rock surfaces by small particles moved by air or water.