Fossil record
The answer is the fossil record :D
The oldest layers of sediments are typically found at the bottom of a sedimentary rock sequence, with the youngest layers at the top. Over time, new layers of sediments accumulate on top of older layers, creating a chronological sequence with the oldest layers at the bottom.
Fossil.
In general, rocks found in deeper layers are older than rocks found in shallower layers due to the principle of superposition, which states that younger rocks are usually on top of older rocks. This is based on the idea that sedimentary rock layers are deposited in chronological order over time.
The fossil record refers to the collection of all known fossils, which are preserved remains or impressions of organisms from past geological eras. It provides insights into the history of life on Earth, including the diversity of species, their evolutionary relationships, and the environmental conditions that existed in the past.
The word you are looking for is "fossil." Fossils are the preserved remains or traces of organisms that lived in the past, typically found in sedimentary rock layers. These remains provide valuable information about the history of life on Earth and can help scientists understand evolutionary processes.
Quite common in cliffs just below Williams Parade Bairnsdale in layers exposed by river erosion. - thewhitefly
Coal is usually found in layers because it forms from the remains of ancient plants that accumulated over time in swamps and marshes. As new layers of plant material build up, the older layers are compressed and transformed into coal through heat and pressure. This process repeats over millions of years, leading to the formation of multiple layers of coal.
Permanently frozen layers of soil are known as permafrost. Permafrost is soil, sediment, or rock that remains at or below 0°C for at least two consecutive years. It is mostly found in polar and high-altitude regions.
The study of earth layers and the artifacts found in them is called archaeology. Archaeologists study past human cultures by examining artifacts, structures, and other physical remains to learn about the history and development of societies.
The word you're looking for is "fossils." Fossils are the preserved remains or imprints of once-living organisms, such as plants and animals, that have been buried and hardened within layers of rock over geological time. They provide valuable insights into the history of life on Earth and its evolutionary processes.
Fossils are most likely to be found in sedimentary rocks. This is because these rocks form from layers of sand, dirt, and debris that accumulate over time and can preserve the remains of plants and animals. Sedimentary rocks often have distinct layers that can hold fossils within them.