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Physical Geography is the study of the earths natural features such as mountains, oceans, jungles, deserts and hills.
Physical geography is basically a type of geograhy that deals with natural aspects that are apart of geo. Such as, mountains, oceans, jungles.
The Rio-Grande serves as the border between Mexico and the United States. It is a river so it would a physical boundary.
Physical geography is natural geography, not human geography. It covers a range of topics such as volcanoes, rivers and farming.
A grasp of how to distinguish between places is a matter of physical geography, which is key in being able to compare different areas of our earth.