A great example of a physical boundary is a mountain. For example, the Pyrenees Mountains, which serve to separate France and Spain, are a physical boundary. So are the Ural Mountains which separate Europe and Asia. Along with mountains, oceans, seas, even deserts are examples of physical boundaries.
An average size apple weighs 6.4 ounces, which is equal to 180  grams. One apple contains approximately 91 calories and 3 grams of  dietary fiber.
Granny Smith apples make a guilt-free addition to your weight-loss efforts. They are naturally low in calories, providing a minimal 80 calories for a medium 3-inch piece of fruit. The high fiber content of Granny Smith apples further helps your weight-loss goals by improving satiety. Soluble fiber, which comes from the soft inside part of the apple, attracts water in your intestinal tract.