Tag: Latin

Rain that evaporates before reaching the ground, hanging from the cloud base like a curtain that never touches the stage. The defining visual of dry-country skies. You see the rain; the ground doesn't.

A shallow, seasonal wetland that fills with winter rain on top of an impermeable hardpan layer, holds water through spring, and dries completely by summer — leaving a cracked, bare depression that gives no sign of what it held. In the weeks between filling and drying, vernal pools support an extraordinary community of life found almost nowhere else: fairy shrimp, tiger salamanders, specialized wildflowers that bloom in concentric rings as the water recedes. Most of California's Central Valley vernal pools have been destroyed by development and agriculture. The ones that remain are among the most endangered ecosystems on the continent.

 The process by which a plant requires a prolonged period of cold before it can flower or germinate. The plant must experience winter in order to know that spring has come. Without the cold, the biological clock doesn't start. Vernalization is the body's memory of seasons — proof that winter is not just endured but needed.

A stone that has been shaped, faceted, and polished by wind-driven sand — its surface planed smooth on the windward side, its edges sharpened to ridges. Ventifacts are the desert's whittled stones, each one a record of prevailing wind direction and duration. Small ventifacts can be picked up and examined; large ones are boulders sculpted in place over millennia.

The darkest, central part of a shadow — where the light source is completely blocked. In an eclipse, the umbra is the cone of total shadow: if you stand within the Moon's umbra during a solar eclipse, the sun is entirely hidden and the sky goes dark. Surrounding the umbra is the penumbra, where the light source is only partially blocked. The umbra is the shadow's heart — the complete absence of direct light.

The seasonal movement of grazing animals — and the people who tend them — between lowland winter pastures and highland summer pastures. Not nomadism; transhumance is a fixed annual circuit between two known places, the rhythm of the year written into the movement of flocks.

 A short-term state of reduced metabolic activity and body temperature, entered by some animals to conserve energy. Hummingbirds enter torpor nightly, dropping their body temperature by as much as 50 degrees Fahrenheit. Unlike hibernation, which lasts weeks or months, torpor is measured in hours — a daily descent into near-death and a daily return.

The complete set of environmental factors — soil, climate, topography, hydrology, microorganisms, and human tradition — that give a food or drink product its distinctive character. The word originated in winemaking, where it names the idea that a wine expresses the place where its grapes were grown — not just the weather or the grape variety but the specific patch of earth, its mineral composition, its drainage, its exposure, its microbial community. Terroir has since expanded beyond wine to describe the place-specificity of cheese, chocolate, coffee, honey, and any food that carries the signature of its origin.

The invasive salt cedar that colonized every altered riverbank in the Southwest after the dams went in, drinking enormous quantities of water, dropping saline leaf litter, and displacing native cottonwoods and willows. The word has become shorthand for what happens when you change a river's hydrology and something opportunistic moves into the wound.

The process by which one tectonic plate descends beneath another and sinks into the earth's mantle — the recycling mechanism of the planet's surface. At subduction zones, oceanic crust dives beneath continental or other oceanic crust at rates of a few inches per year, generating the planet's most powerful earthquakes, its deepest ocean trenches, and its most explosive volcanic chains. The Pacific Ring of Fire is a ring of subduction zones. The Cascadia subduction zone runs from northern California to British Columbia, where it is overdue for a magnitude-9 earthquake that will reshape the Pacific Northwest.