You are here. Cross U.S. Borders. Almost a million times each day, U.S. Customs and Border Patrol (CBP) officers welcome international travelers into the U.S. In screening both foreign visitors and returning U.S. citizens, CBP uses a variety of techniques to assure that global tourism remains safe and strong.
Birches are enchanting trees that embody beauty and grace. While most types of Birch trees grow to roughly 40 feet, some, such as the Paper and Yellow Birch can soar to 80 feet tall.irches are enchanting trees that embody beauty and grace. While most types of Birch trees grow to roughly 40 feet, some, such as the Paper and Yellow Birch can soar to 80 feet tall.
Bark of the birch can be white, grey, yellow, silver or black in color. Young trees have smooth bark. Deep ridges on the bark are characteristic for the older plants. Bark of all birch species (except Grey Birch) peels off in long horizontal strips. Birch has shallow root system which can damage sidewalks and roads in urban areas.