The base level is the lowest point that the river can erode to - usually sea level (of the level of a lake or reservoir) The total amount of erosion and deposition is balances so the rate of erosion of landforms like waterfalls is equal to the rate of deposition elsewhere along the river. What will happen over time to the long profile?
If youâre delving into podcasts for the first time, Appleâs own offering is a decent place to start. The Podcasts app is a free download on the App Store, but it usually come pre-installed on every new iPhone or iPad anyway. The design is in keeping with Appleâs flat iOS 7 aesthetic, opting for a sparse, white background with the odd splash of purple for buttons, toggles and menu tabs.
You can âsubscribeâ to receive a podcast, rather like you might subscribe to a magazine and get it delivered each week. Podcasts are normally managed automatically by a software like iTunes or Zune which will search the web to find the latest programs and automatically deliver it to your computer or portable device.