Answer:
A and C
Explanation:
The rock layers must have formed at different times because they contain two different biozones. The rock layer containing the trilobites must have formed before the one containing the ammonites. The key thing to note here is that the Trilobites only lived from 540 to 248 million years ago. And that the Ammonites were from 245 to 65 million years ago. So there's a 3 million year gap between these 2 different creatures where neither of them existed. So the dig where the trilobites were found has to be at least 3 million years older than the dig where the Ammonites were found. So with that in mind, let's look at the options and see what makes sense.
The rock layers must have formed at the same time because they both contain biozones. * This is nonsense no matter what dates you're speaking of. In effect it claims that all rocks that indicate life were created at the same time. So this is definitely a bad choice.
The rock layers must have formed at different times because they contain two different biozones. * This is technically incorrect since it assumes that all biozones represent an unique period of time which is incorrect. However, since the biozones represented by the presence of Trilobites and Ammonites don't overlap, it is true that these these rock layers were formed at different times. I would have preferred if this option said "non overlapping biozones". But on the balance, I'd consider this option to be true, so it should be selected.
The rock layer containing the trilobites must have formed before the one containing the ammonites. * This is definitely true since the last Trilobite died about 3 million years before the first Ammonite lived. So this is a correct choice.
The rock layer containing the trilobites must have formed after the one containing the ammonites.
* This is the opposite of the previous option. And since the previous option was true, this option must be false. So this is a bad choice
Answer:
Layer D
Explanation:
The rock layer with remains of organisms least similar to present day form can be found in Layer D.
Since layer D is the oldest layer, it will contain the oldest fossil in the undisturbed sequence.
This is because of the principle of fossils and fauna succession.
The principle states that "fossils and fauna succeed on another in a definite order".
- Therefore, the oldest rock layer should contain the oldest fossil which is layer D.
- Layer A is the youngest layer and its fossils will be very similar to those of present day.
- So, the older a rock layer, the more farther it will be in resemblance to present day organisms.
Option D which denotes layer D is the right choice.
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Answer:
Fast
Explanation:
For a river that deposits small particles where it flows into a sea, the current is likely to be fast.
A fast current is only able to winnow through the sediment and removes the fines.
- On reaching the river mouth with the sea, they settle and get deposited
- For a slow current, there is enough time for the energy to get along with the sediments.
- This ensures the proper drag of the particles throughout the session into a basin or the river mouth.
- Most fast currents are not usually deep enough to remove the coarse particles.
Answer:
of nationalism and wars
Explanation:
Yugoslavia was formed in the 1940's, with its leader being Tito. This South Slavic country emerged with the merging of Serbia, Croatia, Bosnia, Macedonia, Slovenia, and Montenegro into one state. Yugoslavia was a socialist country, and even though it had most of the traits as the other socialist countries, it seems to have been much less extreme, and the people in general had it relatively good. The country was developing well and it was prospering, becoming a force to be reckoned with, but also remaining neutral during the Cold War period. This lasted until the death of Tito. Once Tito was gone, everything quickly started to fall apart. The extreme nationalism emerged as the dominant force in the two biggest states, Serbia and Croatia, and the tensions soon led to military conflict. One by one all states started to declare independence, with Macedonia being the only one that didn't engaged in war with anyone in the early 1990's.
