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Are Sedimentary rocks formed from broken fragments called organic?
No, sedimentary rocks formed from broken fragments are called clastic sedimentary rocks. Organic sedimentary rocks are formed from the accumulation of organic material such as plant debris or remains of marine organisms.
Why does sedimentary rocks form?
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).
What are two kinds of rocks that are easily weathered by carbonic acid?
Limestone and marble are two types of rocks that are easily weathered by carbonic acid due to their high calcium carbonate content. Over time, carbonic acid dissolves these rocks, leading to the formation of caves, sinkholes, and other karst landscapes.
What are mold and cast fossils?
A fossil mold is formed by the impression left in rock by the remains of an organism. A cast fossil occurs when the mold is filled in by precipitating minerals.
How does a geode form?
A geode forms in a pocket or hollow circular shaped opening in sedimentary or igneous rock. The opening could be created by a gas bubble, a rotted organism, or by other means. Mineral filled solutions seep into the opening and gradually form crystals from the hole lining inward. If the hole completely infills, it becomes a nodule. Because the minerals that form inside the pockets are often silicate, they are resistant to weathering. This means that the rock surrounding the pocket may not be as resistant to weathering as the geode pocket. Once the surrounding rock has weathered and eroded, what remains on the surface is the geode or nodule. Once an empty circular shaped hole it is now a rock formation unto itself.
What does a mold a cast and a imprint have in common?
They are all forms of fossils created through the preservation of an organism or object in sedimentary rock. A mold is a hollow space left by an organism, a cast is a replica of the original organism, and an imprint is a mark or impression left in the rock.
Can a fossil be an impression of the original organism?
Yes.
What is the impression of an organism called?
The impression of an organism refers to the overall impact or effect it has on its environment, other organisms, or the ecosystem as a whole. This impression can be positive, negative, or neutral depending on factors such as its behavior, interactions, and ecological role.
Can limestone be considered as living organism or has life?
No, limestone is a sedimentary rock, not a living organism.
What conditions make impression fossils form?
The best preservation and fossilization of fossils occurs in calm,aquatic environment.Exceptional preservation also occurs in fine-grained sediments in absence of oxygen.Both this environmental conditions allow easier formation of impression of trapped fossil plant of animal.Impression mainly form from fossils plants and animals that are later decomposed leaving their image shape on the country rock at the time.CONDITIONSWet conditionfine grained country rockaerobic condition that favor decomposition of the fossils leaving behind impression
Two kinds of rock that are easily weathered by carbonic acid?
living organism and acid rain?
Is it true fossils can form when the remains of anorganism decay?
noFossils can form when the remains of an organism decay. ... When a dead organismis buried, it often decayscompletely, leaving only an impression in the rock in a formof a hollow mold. The hard parts are most likely to leave an impression, although sometimes so can soft parts.
Is a sedimentary rock a fossil?
A fossil is any record of an organism preserved in rock, whether it be igneous, sedimentary, or metamorphic. Nearly all fossils are discovered in sedimentary rock.
What are remains of once living organism found in sedimentary rocks?
Fossils.
What are 2 sedimentary rocks that contain dead organism?
Limestone and shale
What are casts and mold?
a mold is an impression of an organism. a cast is a mold filled with sediment
What are five ways fossils can form?
Preservation in sedimentary rock: The organism's remains are buried in sediment and mineralized over time. Casts and molds: The organism's remains decay, leaving an impression in the sediment that is later filled with minerals. Carbonization: The organism's remains are compressed, leaving behind a thin film of carbon. Freezing or desiccation: The organism is preserved through freezing or drying out quickly. Amber preservation: The organism becomes trapped in tree resin, preserving it over time.
