EARTH SCIENCE
FOSSILS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Slowly, minerals in the water replace the bone.
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The bone is no longer a bone, but a rock copy.
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Sediment covers the bone.
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An animal dies.
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Detailed explanation-1: -The first step in becoming a fossil is death. Natural causes, such as predation or disasters could have killed creatures that lived long ago (just as happens today). The second step involves the animal being buried in sediment, preventing it from being eaten by scavengers or decomposed by bacteria.
Detailed explanation-2: -Fossils form in five ways: preservation of original remains, permineralization, molds and casts, replacement, and compression.
Detailed explanation-3: -Four types of process contribute to the formation of a fossil. These are mineralization, carbonization, encrustation and distillation. They occur once an organism has become trapped within the surrounding sediment, and primarily depend on the mineral composition of silt and water.
Detailed explanation-4: -What conditions favor the formation of fossils? How might this cause the fossil record to be biased? The organism generally must have hard parts such as shell, bone, teeth, or wood tissue; the remains must escape destruction after death; and the remains must be buried rapidly to stop decomposition.