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Which phrase describes the relative age of a rock?
refers to how old a certain rock or rock layer is compared to another rock
Which one of the following statements suggest relative age A the top layer of sedimentary rock isn't as old as the layer beneath it B earth was formed 4.6 billion years ago?
Statement A suggests relative age because it implies that the top layer of sedimentary rock is younger than the layer beneath it due to the principle of superposition, which states that in undisturbed layers of rock, the oldest layer is at the bottom. Statement B refers to an absolute age, stating the age of Earth at 4.6 billion years, which is not about the relative age relationship between different rock layers.
If middle layer of rock is 120 million years old what can be said about above and below layer?
The layers above the 120 million-year-old middle layer are likely younger, while the layers below are likely older. This indicates a relative chronological sequence in the deposition of the rock layers, following the principle of superposition in geology.
Where is old eroded rock surface is in contact with a new rock layer?
The contact between an old eroded rock surface and a new rock layer is typically referred to as an unconformity. Unconformities represent gaps in the geologic record where erosion or non-deposition has occurred, leading to a break in the sequence of rock layers. These features are important for understanding the relative timing of events in Earth's history and can provide insights into past environmental conditions.
Evaluate the age of rocks You find three undisturbed rock layers The middle layer is 120 million years old What can you say about the ages of the layers above and below it?
The layer above the 120 million-year-old layer must be younger, and the layer below must be older. So, the layer above the middle layer will be younger than 120 million years, and the layer below the middle layer will be older than 120 million years.
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 layer is an old fossil found?
Fossils are typically found in sedimentary rock layers, which are formed from the accumulation of sediments over time. Fossils are most commonly found in the mid to lower layers of sedimentary rock formations. The specific layer in which a fossil is found depends on the age of the fossil and the geological history of the area.
What is the methods that tells you which layer of rock is oldest but does not tell you exactly how old?
Relative dating
How can index fossils be used to date rock?
Because if you know how old the fossil is, and you find the fossil inside a rock, you know that rock has a maxium age corresponding with the age of the fossil.
What is rock layers?
rock layering is where you have one layer of old rock them a newer layer then an other newer layer.
Superposition can best be explained new layer on old layer?
Superposition is the theory that the rock layer that is on top is the youngest and the layer of rock on the bottom is the oldest.
How old is the rock around a phacops fossil?
The rock around a phacops fossil is typically around 380 million years old, as these fossils are commonly found in rocks from the Devonian period.
How old must a rock be to contain a fossil?
1000 years
Is a fossil in a 2 million year old rock 2 million years old?
no
How can you prove the age of a fossil?
I can answer part of this question. If they can scientists use carbon dating to find the closest age of the fossil. If carbon dating is not possible they use a different technique such as this: If they look at the layers of the rocks, the rocks before and after the layer of rock the fossil was found in, can show an estimate of how old the fossil can be if they know the age of the rock layers before and after its layer.
How do you identify a index fossil?
By using relative age. Over a long period of time, sediment will, layer by layer, coat and cover the fossil, making it difficult for paleontologists and scientists to figure out how old the fossil really is.
What fossil can you use to get aerodactly?
You use an Old Amber. You smash a rock in the Ruins of Alph by using Rock Smash and under one of them there will be an old amber.
