The United States experiences eruptions two or three times a year. Most of them occur in Alaska.
A volcanic eruption refers to the situation where magma is released from a volcano. Volcanic eruptions can be explosive and very dangerous. These eruptions produce lava flows, ash and pyroclastic density currents. destructive. People have died from volcanic blasts. Volcanic eruptions can cause severe threats to health through activities like floods, mudslides, power outages, drinking water contamination, and many more hazardous situations.
More than 1,500 volcanoes have erupted in the past 10,000 years. And among these, about 10 percent have been found occurring in the United States. Most of these volcanoes are found in the Alaska Peninsula.
Learn more about volcanic eruptions here
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I'm NOT 100% sure about this answer but I think it's the Lines of Longitude
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During a full or new moon, when the Earth, moon and sun align, spring tides form, creating higher and lower than normal tides. During the first- and third-quarter moon phases, when the moon and sun are at right angles to the Earth, neap tides occur, creating low and high tides with minimal difference in heights.
<span>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.</span>
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Explanation:
