Half of the world is called a hemisphere. There is the northern hemisphere (top half of the earth) and the southern hemisphere(bottom half of the earth). Hope this helps.
The climate in Saudi Arabia, Iraq, and Iran is mainly Desert.
Those places are located around the Middle East area and the Middle East is covered in dry hot sand so it'll make sense that Saudi Arabia, Iraq and Iran is a desert.
The milky halo is an outer region of the milky way and is an extended spherical component of the galaxy that forms beyond the visible components and is found in the stellar halo, the corona, and has dark matter.
The formation of the stellar halos occurs due to increased gravity and the presence of the primordial black holes. This halo consists of the vast majority of the mass of the galaxy and includes the globular clusters.
