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.
Apples are rich in fiber, which is a type of carbohydrate, but fiber does not convert into glucose and does not have calories. A medium, 3-inch apple provides about 4.5 total grams of fiber, which is separate from the total grams of carbohydrates.