Ansel Adams in the context of "Sunday School"

A Sunday school, known as a Sabbath school in some sabbatarian Christian denominations, is an educational institution or weekly activity in a place of worship, usually Christian in character and often intended for children or neophytes.

Sunday school classes usually precede a Sunday church service and are used to provide catechesis to Christians, especially children and teenagers, and sometimes adults as well. Churches of many Christian denominations have classrooms attached to the church used for this purpose. Many Sunday school classes operate on a set curriculum, with some teaching attendees a catechism. Members often receive certificates and awards for participation, as well as attendance.

A farmworker or farmhand, is someone employed for labor in agriculture. In labor law, the term "farmworker" is sometimes used more narrowly, applying only to a hired worker involved in agricultural production, including harvesting, but not to a worker in other on-farm jobs, such as picking fruit.

Agricultural work varies widely depending on context, degree of mechanization and crop. In countries like the United States where there is a declining population of American citizens working on farms — temporary or itinerant skilled labor from outside the country is recruited for labor-intensive crops like vegetables and fruits.

A darkroom is used to process photographic film, make prints and carry out other associated tasks. It is a room that can be made completely dark to allow the processing of light-sensitive photographic materials, including film and photographic paper. Various equipment is used in the darkroom, including an enlarger, baths containing chemicals, and running water.

Darkrooms have been used since the inception of photography in the early 19th century. Darkrooms have many various manifestations, from the elaborate space used by Ansel Adams to a retooled ambulance wagon used by Timothy H. O'Sullivan. From the initial development of the film to the creation of prints, the darkroom process allows complete control over the medium.

Photograph manipulation or photograph alteration is the modification of an otherwise genuine photograph. Some photograph manipulations are considered to be skillful artwork, while others are considered to be unethical practices, especially when used to deceive. Motives for manipulating photographs include political propaganda, altering the appearance of a subject (both for better and for worse), entertainment and humor.

Depending on the application and intent, some photograph manipulations are considered an art form because they involve creation of unique images and in some instances, signature expressions of art by photographic artists. For example, Ansel Adams used darkroom exposure techniques to darken and lighten photographs. Other techniques include retouching using ink or paint, airbrushing, double exposure, piecing photos or negatives together in the darkroom, and scratching instant films. Software for digital image manipulation ranges from casual to professional skillsets. One of these, Adobe Photoshop, has led to the use of the term photoshop, meaning to digitally edit an image with any program.

This list of North American deserts identifies areas of the continent that receive less than 10 in (250 mm) annual precipitation. The "North American Desert" is also the term for a large U.S. Level 1 ecoregion (EPA) of the North American Cordillera, in the Deserts and xeric shrublands biome (WWF). The continent's deserts are largely between the Rocky Mountains and Sierra Madre Oriental on the east, and the rain shadow–creating Cascades, Sierra Nevada, Transverse, and Peninsular Ranges on the west. The North American xeric region of over 95,751 sq mi (247,990 km) includes three major deserts, numerous smaller deserts, and large non-desert arid regions in the Western United States and in northeastern, central, and northwestern Mexico.