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Fossils are not formed from sedimentary rock, but within it. An organism that is deposited in sediments after death is covered by additional sediments that protect it from predation and decay. Over time, mineral rich water percolating through hard organic tissue (particularly bone) gradually replaces bone, resulting in lithification (sedimentary rock formation). A record of the organism is thus recorded in the rock--a fossil. A second type of fossil is permineralization, or the infilling of cavities within the dead organism with other material. A third type of fossil is the impression left in soft sedimentary layers (particularly mud) of a track (foot step) or body--such as a leaf, shell, fish or bird.
Igneous rock forms from magma; no chance for fossils to form there. Metamorphic rocks are other rock types that are changed by heat and pressure; their transformation and mineral reorganization causes very few fossils to be found there. Sedimentary rock can be formed from the accumulation of sediments and are often formed near ancient shores, basins, and lake beds. If an organism dies and is covered by sediments before rotting or being eaten by scavengers, it could eventually become part of the sedimentary layer that lithifies (becomes rock).
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Why sedimentary rocks could not have been the first rocks on earth?
Sedimentary rocks form from the accumulation of sediment such as sand, silt, or clay. For sedimentary rocks to form, there must be pre-existing rocks that weather and erode to produce sediment. Therefore, sedimentary rocks could not have been the first rocks on Earth as they require the presence of older rocks to form.
Can metamorphic rocks form form igneous but not from sedimentary rocks?
Metamorphic rocks can form from both igneous and sedimentary rocks through the process of heat and pressure, but they are more commonly associated with forming from existing metamorphic or sedimentary rocks. Igneous rocks can indirectly contribute to the formation of metamorphic rocks by heating up and altering surrounding rocks, leading to the formation of new metamorphic rocks.
When rocks undergo weathering they become what type of rock?
When rocks undergo weathering, they can form sedimentary rocks. Weathering breaks down rocks into smaller sediments, which then get compacted and cemented together to form sedimentary rocks.
What types of rocks initially form from deposition?
Sedimentary rocks form from the deposition and compaction of sediment such as sand, silt, and clay. These rocks include sandstone, shale, and limestone.
What are the three types of rocks involved in the rock cycle?
The three types of rocks involved in the rock cycle are igneous rocks, sedimentary rocks, and metamorphic rocks. Igneous rocks form from the solidification of molten magma, sedimentary rocks form from the deposition and lithification of sediments, and metamorphic rocks form from pre-existing rocks that are subjected to high heat and pressure.
Can metamorphic rocks can form from igneous but not from sedimentary rocks?
Metamorphic rocks can form from both igneous and sedimentary rocks
Can Metamorphic rocks can form from igneous but not from sedimentary rocks.?
Metamorphic rocks can form from both igneous and sedimentary rocks
What do sedimentary rocks form from?
Sedimentary rocks form from a few different things. Sedimentary rocks form from sediment is deposited out of air, ice, wind and gravity.
Are sedimentary rocks formed from fragments of other rocks chemical sedimentary rocks?
No, sedimentary rocks formed from fragments of other rocks are called clastic sedimentary rocks. Chemical sedimentary rocks form from minerals that are dissolved in water and precipitate out to form rocks like limestone or halite.
How are clastic sedimentary rocks different from organic sedimentary rocks?
they form
What type of rocks can contain fossils on them?
Sedimentary rocks. and metamorphic rocks made form sedimentary rocks.
What else can sedimentary rocks form from?
All rocks can form from sedimentary because the rock cycle is endless.
What is the or-gin of sedimentary rocks?
weathering of preexisting rocks form clastic sedimentary rocks, Oversaturated water basins form chemical sedimentary rocks after the water evaporates and dead sea organisms settle at the bottom forming biochemical sedimentary rocks.
Rocks that form when sediment cements and hardens together and hardens?
Sedimentary rocks.
What type of rocks weather and erode to form sedimentary rocks?
Igneous, metamorphic, and existing sedimentary rocks can weather and erode to form sedimentary rocks. Igneous and metamorphic rocks can break down into sediments through processes like weathering and erosion, which then may accumulate and lithify into sedimentary rocks. Existing sedimentary rocks can also be reworked and lithified to form new sedimentary rocks through processes like compaction and cementation.
What rocks form from the sediments of the other rocks?
Sedimentary rocks.
Why sedimentary rocks could not have been the first rocks on earth?
Sedimentary rocks form from the accumulation of sediment such as sand, silt, or clay. For sedimentary rocks to form, there must be pre-existing rocks that weather and erode to produce sediment. Therefore, sedimentary rocks could not have been the first rocks on Earth as they require the presence of older rocks to form.
