How did mountain passes influence the rise and decline of ancient indian empires? they allowed invading foreign armies access to northern india. they permitted chandragupta maurya to conquer the deccan rajahs. they prevented contact between the gupta and white hun cultures. they provided routes for migrating peoples from the persian gulf.

The correct answer is A) they allowed foreign armies access to Northern India.

The mountain passes influenced the rise and decline of ancient Indian Empires in that they allowed foreign armies access to Northern India.

Mountains served as a natural barrier to protect cities in ancient times. The problem with these natural barriers such as mountains is that many times they have passes that were used by the army of the enemies to arrive and invade cities. That was the case of India. But Indian mountain passes such as Khyber pass or Nathu La served as an exit for Indian Empires to leave and explore or trade with other territories.  

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.