What are the key differences between a national monument and a national park in terms of their designation and management?

National monuments are typically designated by the President under the Antiquities Act to protect specific cultural, historical, or Natural Resources. They are managed by various federal agencies, such as the National Park Service or the Bureau of Land Management. National parks, on the other hand, are established by Congress and are managed by the National Park Service. National parks generally have more extensive visitor services and recreational opportunities compared to national monuments.