Help as quickly as possible!! Most countries in Sub-Saharan Africa are developing so they have: hint--(high or low)
GDP infant mortality rate
life expectancy % of population under 15
population growth rate literacy rates

What is associated with mid-ocean ridges?

Explain: plate tectonics and people.

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.