FOREST ECOLOGY
FOREST SUCCESSION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
the bottom layers have folded over the top layers.
|
|
|
all of the layers are the same age.
|
|
|
the bottom layers are younger than the top layers.
|
|
|
the bottom layers are older than the top layers.
|
Detailed explanation-1: -It is based on the Law of Superposition which states that in undisturbed rock sequences the bottom layers are older than the top layers. Therefore, some discovered fossils are able to be dated according to the strata, a distinct layer of rock, that they are found in.
Detailed explanation-2: -Law of Horizontality As sediments deposit, they deposit in horizontal layers. This is known as the Law of Horizontality. The oldest layers are at the bottom and the newest layers are at the top. If you were to dig down through the layers, you would be going back in geologic time.
Detailed explanation-3: -As the layers of sediment build up on top of one another, they create a physical timeline. The oldest layers, along with the organisms that were fossilized as they formed, are deepest. The youngest layers are found at the top.