Which of the following features are found at an oceanic-continental convergent plate boundary?choose all that apply: 1-island ar
c2-continental arc3-mid-ocean ridge4-mountains5-trench
2 answers:
Answer: 1. Island Arc, 4. Mountains, 5. Trench
Explanation:
A thick less dense continental plate and a thin, dense oceanic plates are two tectonic plates that comes together to create an oceanic-continental plate boundary. The process is called subduction.
The convergent boundary forms strong earthquakes, volcanic mountains or volcanic arc mountain ridges on the surface when the sinking oceanic plates melts.
Other features formed along tectonic plate boundary include: OCEAN TRENCHES, ISLAND ARC, SUBMARINE MOUNTAIN RANGES, and some others.
Therefore, only numbers 1, 4 and 5 are correct.
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Here is the full question
Suppose there are 10,000 civilizations in the Milky Way Galaxy. If the civilizations were randomly distributed throughout the disk of the galaxy, about how far (on average) would it be to the nearest civilization?
(Hint: Start by finding the area of the Milky Way's disk, assuming that it is circular and 100,000 light-years in diameter. Then find the average area per civilization, and use the distance across this area to estimate the distance between civilizations.)
Answer:
1000 light-years (ly)
Explanation:
If we go by the hint; The area of the disk can be expressed as:
where D = 100, 000 ly
Let's divide the Area by the number of civilization; if we do that ; we will be able to get 'n' disk that is randomly distributed; so ;
The distance between each disk is further calculated by finding the radius of the density which is shown as follows:
replacing d = in the equation above; we have:
The distance (s) between each civilization =
= 2 (500 ly)
= 1000 light-years (ly)