When the relative pronoun is the object of a preposition, which is used instead of that, for example,  in which ,  for which ,  about which ,  through which , etc. (please see the third example below): Formal English: This is the man to whom I wanted to speak and whose name I had forgotten.he relative pronoun that can only be used in restrictive clauses. It can also be substituted for who (referring to persons) or which (referring to things) in informal English. Whereas that is often used while speaking, who and which are more common in formal written English.
For other uses, see Yellowstone (disambiguation). Yellowstone National Park is a national park located in the U.S. states of Wyoming, Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first National Park in the U.S. and is also widely held to be the first national park in the world.
Yellowstone National Park Location. Yellowstone National Park is located in the western United States in Idaho, Montana, and Wyoming.One percent of the Yellowstone is located in Idaho, three percent is located in Montana, and ninety-six percent is located in the state of Wyoming.It spans 3,472 square miles / 8,987 square km, or 2,221,766 acres / 898,317 hectares, or 63 air miles (102 km) north to south, and 54 air miles (87 km) east to west.ne percent of the Yellowstone is located in Idaho, three percent is located in Montana, and ninety-six percent is located in the state of Wyoming.