Labor certification is  a United States of America immigration process step. Its stated goal is to protect U.S. workers and the U.S. labor market by ensuring that foreign workers seeking immigrant visa classifications are not displacing equally qualified U.S. workers..
How are local winds and global winds differ? local winds-are winds that blow over short distances caused by unequal heating of the earths surface in a small area. global winds-are winds that blow around the earth from â¦ the north pole to the south pole.
Why is one global wind pattern known as trade winds? They blow reliably in the same direction, at the same latitudes, year round. Sailing ships engaging in trade needed them so that they could make collections and deliveries whe â¦ n required, not just when the wind happened to blow.