Consider two planets with uniform mass distributions. the mass density and the radius of planet 1 are rho1 and r1, respectively, and those of planet 2 are rho2 and r2. what is the ratio of their masses?

Explanation:

The mass density of an object with uniform mass distribution its defined as

.

So, if we know the volume, and, we can obtain the mass of the object:

.

Now, we can take the planets as spheres, of course, this is only an approximation, but good enough for us. The volume of a sphere of radius r its:

So, for our planets, the mass its given by:

,

so

Now, we can take the ratio:

Now, we can just cancel the .

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

i think the answer would be reserve.