Canyon Dusk

Canyon

A canyon, gorge or chasm, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales. Rivers have a natural tendency to cut through underlying surfaces, eventually wearing away rock layers as sediments are removed downstream. A river bed will gradually reach a baseline elevation, which is the same elevation as the body of water into which the river drains. The processes of weathering and erosion will form canyons when the river's headwaters and estuary are at significantly different elevations, particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering.

Dusk

Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall. At predusk, during early to intermediate stages of twilight, enough light in the sky under clear conditions may occur to read outdoors without artificial illumination; however, at the end of civil twilight, such lighting is required to read outside. The term dusk usually refers to astronomical dusk, or the darkest part of twilight before night begins.

canyon

Noun

1. A valley, especially a long, narrow, steep valley, cut in rock by a river.

Verb

1. Of water, liquid, or another substance, to flow in or into a canyon.

dusk

Adjective

1. Tending to darkness or blackness; moderately dark or black; dusky.

Noun

1. The time after the sun has set but when the sky is still lit by sunlight; the evening twilight period.
2. A darkish colour.