The oldest layer in the diagram is

In the diagram, layer 1 has rocks which are the oldest. Explanation. Rocks are arranged in layers that contain fossil with the oldest fossils represent at the deepest layers and the youngest fossils present near the top. Using this concept, the oldest rock layers are located at the bottom (layer1) and the youngest at the top(layer 6).

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.