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.
How many calories in an apple? Apples come in many varieties, colours and tastes, from Golden Delicious, to Braeburn, Cox, Gala, Bramley and Granny Smith. We eat around 482,000 tonnes of apples each year in the UK, including home-grown and imported varieties. Fresh, dried, or as apple juice or cider are all ways to enjoy apples. A medium sized (180g) raw eating apple, including the skin, provides around 85 calories. Around 85% of an apple is water, approximately 14% is carbohydrates - mainly as the sugar fructose - and the remaining 1% by weight is protein and fat.