The border separates Sonora and Chihuahua is Natural boundary
Earth is composed of four main layers, starting with an inner core at the planet's center, enveloped by the outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius.
source: nasa
Answer:
8 plants in the solar system
Japanese archipelago or the Japan Sea
Answer:
Tectonic plates
Explanation:
is a theory that explains the way the coldest and stiffest outer portion of the lithosphere is structured on Earth