GEOLOGY

Detailed explanation-1: -The newest, thinnest crust on Earth is located near the center of mid-ocean ridge-the actual site of seafloor spreading. The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge.

Detailed explanation-2: -As new seafloor moves away from the mid-ocean ridge, it cools, contracts, and becomes denser. This denser, colder seafloor sinks, helping to form the ridge. The theory of seafloor spreading was later supported by the following observations.

Detailed explanation-3: -Because of this recycling, the age of the oceanic crust varies depending on location. Areas where new crust is being formed at mid-ocean ridges are much younger than zones further away (Fig. 7.58). By contrast, continental crust is rarely recycled and is typically much older.

Detailed explanation-4: -The fact that the youngest rocks are located at the mid-ocean ridges is evidence for seafloor spreading. The Theory of Seafloor Spreading is also supported by magnetic evidence in rocks and by the ages of rocks on the ocean floor.

Detailed explanation-5: -The youngest ocean floor is located on the mid-ocean ridge. Where is the oldest ocean floor located? The oldest ocean floor is located near the continents, next to a subduction zone.