What are key features to geographic grid and how is it useful to geographers?

The large connected urbane area from boston to washington, d.c. is often referred to as

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

Why are young eastern european democracies at an increased risk for turmoil during a global recession? a) anger against increased democracy b) failure of the free market system c) government corruption d) lack of from the e.u.