Why did many Irish emigrate to the other countries in the mid 1800s

The model of human settlement suggests that uthe model of human settlement suggests that urban growth is patterned around transportation networks such as railroads and highways. a. burgess b. hoyt c. sauer d. von thunenrban growth is patterned around transportation networks

Why did macarthur want to invade china? why did truman oppose this?

At which point on the diagram do convection currents occur to drive plate movement?