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How can scientists understand what the relevant age of a fossil is?
There are layers of earth that are deposited over time and based on where a fossil is in the layers a scientist can understand what the age of the fossil is relevant to another fossil in a different layer of earth. The law of superposition says that new sediment is deposited on top of old sediment so, the sediment in the bottom layer is the oldest and the sediment at the top is the youngest. Because of this the fossils in the bottom layer are the oldest and the fossils near the top are the youngest. Say you have 10 layers of rock, and the top layer is number 1 (the youngest) and the bottom layer is number 10 (the oldest). Even if a scientist can't tell exactly how old a fossil is if they know it is in a layer deeper than another fossil they know it is older than that fossil so, a fossil from layer 9 is older than a fossil from layer 5 which is also older than a fossil from layer 3. This is relative age. If we take it a step further... If a scientist knows that the fossil in layer 4 is 65 million years old than we not only know the fossils in layer 5-10 are older than the one in layer 4, but that they are all older than 65 million years old. So, the fossils in layer 1-3 would be less than 65 million years old. Scientists can know how old a specific fossil is sometimes based on whether or not it is an index fossil (a fossil that only occurred during a very small, specific interval of time), or if it is possible to carbon date it or something in the same layer.
What principle is a geologist applying when deciding that a fossil in a mud layer is older than a fossil in a sandstone layer above it?
The geologist is applying the principle of superposition, which states that in an undisturbed sequence of rock layers, the oldest rocks are at the bottom and the youngest are at the top. This helps geologists determine the relative ages of fossils found in different layers of sedimentary rock.
How the upper layer of the atmosphere differ from bottom layer?
The upper layer is different from the bottom layer because the bottom layer has more gualities to a living thing than the upper layer.
How the upper layers of the atmosphere differ from the bottom layer?
The upper layer is different from the bottom layer because the bottom layer has more gualities to a living thing than the upper layer.
Is the bottom layer of the atmosphere?
The bottom layer of the atmosphere is called the troposphere.
What is they layer of tissue underneath epidermis and hypodermis?
The skin layers from top to bottom are the epidermis (top layer), dermis (middle layer), and hypodermis (bottom layer).
In procedure B how many years are represented between the top and bottom fossil bearing layers?
To determine the number of years represented between the top and bottom fossil-bearing layers in procedure B, you would typically look at the stratigraphic data or radiometric dating results provided in the context of the study. If specific dates or a range is given in the procedure, you can subtract the age of the bottom layer from the age of the top layer to obtain the total time span. Without specific data, I cannot provide an exact number of years.
Why does the bottom layer of the rainforest receive less sunlight than the top layer?
Because the leaves and branches of the top layer block sunlight from reaching the bottom layer.
What is the name for the bottom oldest layer of rock?
The bottom layer of rock in a geologic sequence is usually called the basement layer.
What can she infer about the ages of the two rock layers?
She can infer that the rock layer with the fossil is younger than the layer without the fossil because the fossil was deposited after the formation of the rock layer. This provides a relative age relationship between the two layers.
What is the name of the bottom rock layer?
The bottom layer of a sedimentary rock is called the basal layer. This layer is considered the coarsest in the rock.
Which forms first a fossil mold or a fossil cast?
First, a thin layer of sediment hardens and forms a mold. Then, what is known as a cast is when a new layer of sediment fills in the mold breaking down the creature/ animal/fossil.
