In which hemisphere is America, Africa, Australia relative to the equator, relative to the prime meridian

The northern and southern hemispheres exist relative to the equator, and the western and eastern hemispheres are relative to the prime meridian. Let’s take a look at each geographic feature in turn:
America is a part of the world, consisting of North and South America. North America is located in the northern hemisphere, South America – for the most part – in the southern hemisphere, but still the northern part of the continent is located in the northern hemisphere. Both continents of America are located in the western hemisphere.
Africa is located in all four hemispheres.
Australia is located south of the equator, i.e. in the southern hemisphere. It is also entirely located in the eastern hemisphere of the Earth.