B) I believe I think so I’m not sure
First measure first P wave and the first S wave. then the amount of secs it took, then find the distance from the first point out then go left to find it.
Answer:
D. physical boundary
Explanation:
Google the himalayas as borders in south east asian countries, you'll clearly see that they exist as physical boundaries between nations such as Nepal and China.
They seceded because B)They wanted to keep slavery