The age, density, and thickness of oceanic crust increase with distance from the mid-ocean ridge. Eventually, older oceanic crust encounters a tectonic boundary with continental crust. How to form magnetic striping: new oceanic crust forms continuously at the mid-ocean ridges The two parts of the oceanic plate are pulled apart, and magnetic stripes become older as they move away from the mid-ocean ridge.
All food chains and webs have at least two or three tropic levels. Generally, there are a maximum of four tropic levels. Many consumers feed at more than one tropic level.
