The amplitude and frequency of such tides is affected by the moon's location as it revolves around the Earth. The gravitational pull of the moon creates a tidal bulge at the location directly beneath its location. Every two weeks or so, the moon aligns with the Earth and sun in a straight line -- the new and full moon phases -- resulting in the maximum gravitational force on our planet's oceans. These periods are referred to as spring tides..
http://d3fzrw9hngh8qa.cloudfront.net/glossary/CORECountries.mp4. According to a way of thinking about economies known as World Systems Theory, CORE countries are strong and wealthy countries that generate lots of wealth, and on which other countries depend. In the 14th century, Mongolia was a CORE country, and Italy was a peripheral country.
Definition. A unique ability that a company acquires from its founders or develops and that cannot be easily imitated. Core competencies are what give a company one or more competitive advantages, in creating and delivering value to its customers in its chosen field. Also called core capabilities or distinctive competencies. See also core rigidities.