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A unique feature of diatom cells is that they are enclosed within a cell wall made of silica<span> (hydrated silicon dioxide) called a </span><span>frustule.</span>
The hypothesis is the question you are trying to answer or the problem you need to figure out, it is kind of like a starting point
Ice would be able to slide past another
<span>New crust is formed on the opposite end of the plate as it is pulled away from</span>