Geology How thick is the outer layer? February 2, 2026 by Mercier | Leave a Comment The outer layer of the Earth, known as the crust, varies in thickness from about 5 kilometers (3 miles) under the oceans to around 70 kilometers (43 miles) under the continents. Understanding the crust’s thickness is crucial for comprehending Earth’s geological features and processes. What Determines the Thickness of the Earth’s Outer Layer? The thickness […] Read more ยป