How often does earths magnetic field change direction?

about every 1 million years

about every 2 million years

about every 3 million years

about every 4 million years

What are the answers for the following questions?

Technology has affected regional settlement patterns in what ways? choose all that apply. climatic improvement strategies have improved crop productivity. mechanized agricultural methods have improved agricultural productivity. participation in the global economy has increased urbanization. population shifts from urban to rural areas has increased as a result of petroleum production. settlement areas have increased as a result of improved water storage and delivery systems.

What landform caused by water erosion and deposition is shown in the image?