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Practice Reading: Fill in The Blanks (Drag & Drop)
ID: #39476
A consequence
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The perfect conditions for fossil creation are usually found in lakes and seas, as the remains have to be surrounded by water. This explains why fossils of marine species are more common than terrestrial ones. For fossils to form, the dead organism must be buried quite quickly, for example in mud or sand. This is because to oxygen leads to rapid and complete decay, making fossil formation an . Over an long period of time, the layer of mud or sand that's covering the dead organism becomes thicker. A consequence of this is that the deepest levels eventually come under such that they gradually turn into rock. Meanwhile, minerals from the water seep into the organism's tissues, causing them to harden. This creates a solid outline of the organism encased in rock - a fossil.
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