The physical map would show some features that make natural borders, such as rivers, shores, mountain ranges. Those features are then likely places for borders, since they're hard to attach and easy to defend, and the physical features explain why the border is where it is and not for example 5 km next to them
Answer:
a seismic wave that travels along or parallel to the earth's surface
Explanation:
Erie has 100 000 people, and Pittsburgh has 300 000 - so from the first two Pittsburgh is the bigger one.
Philadelphia has 1.5 million people living in it - it is also the biggest city in Pennsylvania (this is the state where all the cities are) - and this is also the correct answer!
It is not the capital however, as it's Harrisburg.
B. energy produced from the splitting of atom.
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