The Moon is thought to have formed when an object roughly the size of Mars hit the Earth. The impact was so violent that it threw large amounts of the Earth's mantle into orbit. This material evenually coalesced and formed the Moon.
Ansel Easton Adams was an American photographer and environmentalist. His black-and-white landscape photographs of the American West, especially Yosemite National Park, have been widely reproduced on calendars, posters, and in books.
Dorothea Lange. Photojournalist Dorothea Lange's most famous photo, Migrant Mother, (pictured below middle) taken in 1936 of pea-picker Florence Owens Thompson and her children, was part of the Depression-era images for which she is most known. Photographer Dorothea Lange.