We can use the formula for the volume of a sphere:
$V = \frac{4}{3}\pi r^3$
where $V$ is the volume and $r$ is the radius. Plugging in the given radius of 7 kilometers, we get:
$V = \frac{4}{3}\pi (7\,\text{km})^3 \approx 1436.76\,\text{km}^3$
Now, we need to
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