Air in a low-pressure system to the upper atmosphere. It cools and flows to the pressure area and to the Earth's surface. It warms, then flows across the Earth's surface to the pressure system.

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