Which statement describes uniformitarianism? the continents at one time were all part of a large landmass, but then they separated and moved apart. in an undisturbed layer of rock, older rocks lie at the bottom and younger rocks lie at the top. the forces that act to change earth's surface today are the same forces that acted upon earth's surface in the past. layers of sedimentary rock contain more fossils than layers of metamorphic or igneous rock.

The forces that act today are same forces that acted upon earths surface in the past.

Explanation:

The law of Uniformitarianism is the basis of the natural laws and processes that operate in the present day and has been operating since the past and is a universal phenomenon. As the key statement " the presents the key to the past ".  The geologic events that now operate slowly were very fast at some point in time, and it was supposed to have contrasted to that of the law of catastrophism starting with the works of James Hutton. He is supposed to get the idea that due to repeated cycles of erosion and deposition on the seabed. The earth landmass which was a primordial rock got transformed due to various geologic and thermal processes that operate even today but not with the very same intensity.

This type of energy is called radiant energy.