Because hot air is less heavy cold air is more heavy causing them to shift if cold air is placed on top.
Explanation:
here a story....
susan was just on a walk with his pet,
a dog named painty,
suddenly dog started acting like a dump...it gone mad , and started barking at susan,
susan was so scared so she called a police,
and told them "please, save me from my painty"
police laughed and just ignored him...
then dog started showing symptom of the rabies...
and that dog opened his mouth...and gave her a big strong bite in her buttt....
suddenly alarm rang ...
and she woke up from a scaring dream...
susan will never forget what happened in the dream that day...
This are some of the things behind imperialism in Africa.
1) Need for resources,
2) Political competition
3) Technological advances
Economic factors were more of a driving force behind imperialism because the imperialists were in need for natural resources for them to improve their technology and their national pride.
Brazil borders venezuela to the south
