A. His landscapes helped with the formation of national parks.
B. He worked with photographers on expeditions of the West.
D. He used many values and variations of colors.
The above given statements about Thomas Moran or his art are true.
<u>Answer:</u> Option A, B & D
<u>Explanation:</u>
Thomas Moran was a New York's American Hudson River School painter and printmaker. His art has often showcased the Rocky Mountains. Moran and his family, took up residence in New York where they got work as artists. When establishing Yellowstone National Park, Thomas Moran's concept of the Western landscape was important.
Moran was an integral part of the 1872 Hayden Geological Survey. In 1884 Moran was selected to the National Academy of Design membership, and in his elder years he created several works of art. As part of the White House series, Thomas Moran has a painting on display.