What comes to bedsides icy bridges battlefronts and crumbling bridges?

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

What border separates sonora and chihuahua national border state border physical boundary natural boundary

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?