European explorers were responsible for colonizing land on every continent except Antarctica. Then, in determining boundaries between continents, are bona fide boundaries between continents necessary, preferable, or even possible? A very small portion of the total land area is made up of islands that are not considered physical parts of continents.
The indigenous population, estimated to have been betweenand 1, in [ clarification needed ],  declined for years following settlement, mainly due to infectious disease. The falls are so high that most of the water evaporate s into mist or is blown away by wind before it reaches the ground.
The Nile has played an important role in the history of Africa. These include the grey-banded muniaVogelkop bowerbirdand the king bird-of-paradise.
The Appalachians of North America and the Urals, on the border between Europe and Asia, are older mountain ranges that are not geologically active. In ancient Egyptian civilizationit was a source of life for foodwater, and transportation.
Many plants and animals reached the islands from southern Asia during the last glacial periodwhen sea levels were low enough to allow for travel. Continental Features The surface of the continents has changed many times because of mountain building, weatheringerosionand build-up of sediment.