Please select the word from the list that best fits the definition states that for undisturbed rocks, the oldest rocks are on the bottom and the rocks become younger and younger toward the top

superposition

Explanation:

Superposition may be defined as  placement of certain things or bodies lying on top of the other or above. This same principle is used to determine whether the one sedimentary rock is older than the other. This principle is known as the principle of superposition.

According to this principle, the oldest sedimentary rocks lie at the bottom and the newly formed rocks are placed at the top of the layers of the undisturbed rock.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.