1.which evidence would confirm that a given rock layer is newer than the layers around it?
It has been crumpled and folded, while the other layers lie flat.
Other layers have been deposited above it.
It is horizontally-oriented.
It cuts through all the other layers.(this)
i think its C or D but im not sure.
2.which of the following are methods of relative aging of rocks? (three answers)
superposition(this)
horizontal relationships
angular relationships
cross-cutting relationships(this)
original angularity
faunal succession(this)
if any of these are wrong please explain so i know next time.
It's d : it cuts through all the layers. And for number 2 , your answers are right
why all the thumbs down?? he was just helping
1. D. It cuts through all the other layers. This would suggest that the rock layer is younger than the layers it cuts through because it must have formed after the surrounding layers were already in place.
2. The correct answers are:
- Superposition: This principle states that in undisturbed rock layers, the oldest rocks are found at the bottom, and the youngest rocks are found at the top.
- Cross-cutting relationships: This principle states that any feature that cuts across a rock or rock layers is younger than the rock it cuts across.
- Faunal succession: This principle is based on the observation that different fossil organisms appear in a predictable order in the rock layers, allowing for relative dating.
Horizontal relationships, angular relationships, original angularity are not specific methods of relative aging of rocks. They do not provide direct information about the relative age of the rocks.
1. The correct answer is D) It cuts through all the other layers. This evidence suggests that the rock layer in question must have formed after the other layers were already present. When a rock layer cuts across or intersects other layers, it means that the deposition of the rock layer occurred after the formation of the other layers. This phenomenon is known as cross-cutting relationships and is a key principle in relative dating.
2. You have correctly identified three methods of relative aging of rocks:
- Superposition: This principle states that in undisturbed rock layers, the youngest rocks are at the top, while the oldest rocks are at the bottom. This principle is based on the observation that sedimentary rock layers are deposited in a sequential manner, with each new layer being laid down on top of the previous layers.
- Cross-cutting relationships: This principle states that any feature or rock that cuts across another rock layer or feature must be younger than the rock or feature it cuts through. For example, if a fault or igneous intrusion is found cutting through a rock layer, it indicates that the fault or intrusion must have happened after the deposition of the rock layer.
- Faunal succession: This principle is based on the observation that different fossils appear in different rock layers. By studying the fossils found in sedimentary rock layers, scientists can determine the relative ages of the rocks. The principle assumes that fossils found in deeper layers are older than the ones found in shallower layers.
You did a great job identifying the correct methods of relative aging. Well done!
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