What process uses rock layers and index fossils to determine an object's estimated age?
Group of answer choices
Radioactive dating
Law of superposition
Relative dating
Geologic time
The process that uses rock layers and index fossils to determine an object's estimated age is relative dating.
Radioactive dating involves determining which of the following?
Group of answer choices
Half-life decay
Index fossils
Depth of layers
Geologic time
Radioactive dating involves determining half-life decay.
The table below shows the age of fossils found in four separate layers of an undisturbed rock:
Fossils In Rock Layers
Layer Fossil in Layer Age of Fossil (million years)
A W 550
B X 240
C Y 680
D Z 450
Which is the topmost layer of the rock?
Group of answer choices
Layer A
Layer B
Layer C
Layer D
Flag question: Question 4
Question 4
From the given information, Layer B has the youngest age of fossils (240 million years). Therefore, Layer B is the topmost layer of the rock.
The diagram below shows the layers of a rock having a trilobite:
A rock column labeled Rock is shown. The column has three layers. The bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, Trilobite, in the key, the top layer has two semicircles. A key is shown on the right side of the diagram. The shaded rhombus is marked as A, the rhombus with the diagonal is marked as B, the semicircle is marked as C
Which statement about the rock fossils is true?
Group of answer choices
Fossil B is older than fossil A.
Fossil A is younger than fossil C.
Fossil C belongs to the same period as the trilobite.
Fossil B belongs to the same period as the trilobite.
Based on the given diagram, the correct statement about the rock fossils is: Fossil B belongs to the same period as the trilobite.
Scientists find the same type of index fossil in two different locations on Earth. What can they conclude from this discovery?
Group of answer choices
The fossils are different ages due to the location.
The index fossils are the same geological age.
One index fossil is older than the other.
There is not enough information to make a conclusion.