What is the reason that scientists divide the earth into two different sets of layers

Religious conflict in northern ireland started with a) cultural differences resulting from viking invasions around 800 b) england’s split from the catholic church in the 1500s c) rebellions in ireland between 1916 and 1921 d) the norman invasion of england in 1066

Is our world actually shaped as a globe

Match the region in column 1 to the river in column 2