Answer:
The blank is "apart."
Explanation:
Mid-ocean ridges are geologically important because they occur along the kind of plate boundary where a new ocean floor is created as the plates spread apart. Thus the mid-ocean ridge is also known as a "spreading center" or a "divergent plate boundary." The plates spread apart at rates of 1 cm to 20 cm per year.
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D. Batu, tumbuhan,dan air
So, the population went up with every spring season and fell slightly in the winter; it increased within the course of 10 years