We can actually deduce here that the text structure found in this excerpt is: Description.
Text structure actually refers to the way that a particular text in a passage is organised and arranged in order to make readers understand what the writer is passing across.
Description is used in this Sinking of the Titanic passage. We can see that in the way the writer reveals the tonnage of each vessel, the measurement of the Titanic, its length and even its speed.
Description is usually used when one is trying to refer to the features of a particular thing in order to create a picture of the object being described in the minds of the readers.
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