Meaning of a nonzero y-intercept to a graph of reaction distance versus speed

It means that there's something else besides speed that contributes to reaction distance.  So even when speed is zero, reaction distance is still not zero.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.