Who took rock-n-roll mainstream? That is who made it popular with American teenagers in general?
1 answer:
You might be interested in
<h2>
</h2>
Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time; Earth's mass has grown with the volume in such a way that the surface gravity has remained constant; Earth's gravity at its surface has increased over time, in line with its hypothesized growing mass and volume.