In some places, one or more rock layers are missing in a sequence. for example, suppose you find a sequence of five layers. you investigate the fossils in them and date some of the rocks. you find that there seems to be a large gap between the time that layer 3 was deposited and the time that layer 2 was deposited. this is called a/an

Romer's Gap

Explanation:

These gaps are represented by the periods from where there are no relevant fossils records. Romer's gap is given by the paleontologist i.e Alfred Romer, who was the first to coin it. Romer's gap spanned from about 360 to 345 million years ago, with the corresponding gap to first occur over the period of 15 million years of the Carboniferous Period. Du to the distinctions found in the geochemistry of the rocks that did not favor the development of the fossils may be due to the evolution of history or the occurrence of a natural disastrous event.

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

Physical systems is the answer