Question

the law of superposition says that younger rocks are -- older rocks.
options: denser, found on top of, found below, more filled with fossils

Explanation:

The law of superposition states that in undisturbed rock layers, younger rocks are found on top of older rocks. So we need to find the phrase that fits this concept. Among the options, "found on top of" is incorrect for younger relative to older (younger should be on top, older below), wait no—wait the sentence is "younger rocks are -- older rocks". Wait, no, let's re - read. The law of superposition: younger rocks are found on top of older rocks? Wait no, no—wait, no, the correct statement is that in a sequence of sedimentary rocks (undisturbed), the older rocks are at the bottom and younger on top. So the sentence is "The law of superposition says that younger rocks are -- older rocks". So the correct phrase is "found on top of"? Wait no, wait the options: the options are "denser", "found below", "found on top of", "more filled with fossils". Wait, no, let's look at the options again. The options are in the boxes: "denser", "found below", "found on top of", "more filled with fossils". Wait, the law of superposition: younger rocks are found on top of older rocks. So the correct phrase to fill in the blank is "found on top of"? Wait no, wait the sentence structure: "younger rocks are -- older rocks". So if younger is on top, then younger rocks are found on top of older rocks. So the correct option is "found on top of"? Wait, but let's check the options. Wait the options given are: "denser", "found below", "found on top of", "more filled with fossils". Wait, no, in the image, the options are: first row: "denser", "found on top of"; second row: "found below", "more filled with fossils". Wait, the law of superposition: in a stack of undisturbed sedimentary rocks, the oldest rocks are at the bottom, and each successive layer is younger than the one below it. So younger rocks are found on top of older rocks. So the correct phrase to complete "younger rocks are -- older rocks" is "found on top of".

Answer:

found on top of