Origin of fossils.

Fossils are relics of ancient creatures buried in strata, and the most common fossils are formed by teeth and bones. After the death of ancient animals, the internal organs, muscles and other soft tissues of dead bodies will soon decay. Teeth and bones can be preserved for a long time because of less organic matter and more inorganic matter. If the corpse happens to be buried by sand and isolated from 空 gas, the decay process will slow down. There is slowly flowing groundwater in the sediment 空 gap.

Fossils are relics of ancient creatures buried in strata. The most common fossils are formed by teeth and bones. After the death of ancient animals, the internal organs, muscles and other soft tissues of dead bodies will soon decay. Teeth and bones can be preserved for a long time because of less organic matter and more inorganic matter. If the corpse happens to be buried by sand and isolated from 空 gas, the decay process will slow down. There is slowly flowing groundwater in the sediment 空 gap. On the one hand, the water flow dissolves the minerals in rocks and sediments, on the other hand, it precipitates the surplus minerals in the water or turns them into crystals, which will gradually seep into the bones buried in sediments along with the water flow, filling the 空 space left by the decay of organic matter in teeth and bones. If the conditions are suitable, the minerals seeping into the bones from the outside can effectively replace the original organic matter of the bones before the teeth and bones decay and disintegrate, and the teeth and bones will be well preserved as fossils. Because a large number of minerals in fossils are very carefully and slowly replacing the organic matter, the original shapes of teeth and bones can be completely preserved, and even the tissue shapes that can be clearly seen by an electron microscope can be preserved as they are. Over time, the weight of bones has been increasing, and the original teeth and bones have changed into stones that preserve the original shapes and internal structures of teeth and bones. This process is called “fossilization process”. In addition to teeth and bones, some animal feces can also be fossilized. For example, some carnivores swallow meat together with broken bones. There are many broken bones that have not been digested in feces. Broken bones are not easy to rot, so they can also become fossils. Footprints can also become fossils. Or animals step on the sand, causing footprints. When the sand is dry, the footprints are filled with other substances. The two substances are preserved after being petrified by the minerals that infiltrated later, but the properties of the two substances are different, their hardness is different, and the degree of easy weathering or destruction is also different. When one substance is weathered or destroyed, the other substance appears as a footprint fossil.

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