Some of these are accountable, but the main reason the settlement boom happened is D, gold was discovered.
Sunlight is type of EM wave. The intensity of EM follows inverse square law.

This means that the intensity at a distance that is n times greater will be n^2 times smaller.
Now we set this equation to be equal to 9 and we solve it for n:

The intensity is 9 times greater at a distance that is equal to a 1/3 of Earth's distance:
Answer
<u>A rapid improvement in standard of living can mean rapid economic growth with increased population in towns resulting to damaged environment in form of pollution.</u>
Explanation
When the standard of living is associated with rapid growth of the economy, a common scenario is migration of people to urban areas to work and operate businesses. The urban areas will experience increased populations with inadequate housing. The environment will be suppressed because more forests will be cleared to give out spaces for new housing projects. In addition to that, the pollution levels will increase because more wastes will be generated.
Answer:
Our solar system consists of the Sun(an average star), the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. It also includes the satellites of the planets; numerous comets, asteroids, and meteoroids, and the interplanetary medium.
Explanation:
The composition is more of what our solar system has. Hope I helped!
1 shale
2 schist
3 conglomerate
4 granite