Please solve this i cant!

What were the purposes of salt? check all of the boxes that apply. -to achieve peace -to protect the security of the united states -to form an alliance against communist nations - to stop the nuclear arms race - to give the united states an advantage over the soviet union

What major land feature is located at 0* and 20* e? a sahara desert b kalahara desert c congo basin d the alps

Which physical feature minimizes population density in northern africa?