The Earth's crust is the layer we know best, but it only makes up about 1.4% of the planet's total volume. To answer this question, we need to explore the Earth's inner structure. The Earth's inner structure is made up of four main layers: the crust, mantle, outer core, and inner core. The crust is the outermost layer, the mantle makes up about 84% of the Earth's volume, the outer core is a liquid layer of iron and nickel, and the inner core is a solid layer of iron and nickel at the center of the Earth. Bridgmanite is a mineral found in the Earth's mantle that helps us understand the mantle's structure. Tuzo Wilson and Jason Morgan are two important geologists who helped us understand the Earth's structure. The Earth's mysterious blob refers to the complexity and mystery of the Earth's inner structure, which still holds many secrets. Did you know that the Earth's inner core is about 5,150 degrees Celsius, which is even hotter than the surface of the Sun? Understanding the Earth's inner structure helps us understand natural disasters and how to use and protect the Earth's resources. Exploring the Earth's mysterious blob is an adventure that invites scientists, students, and everyone to learn more about the Earth's inner structure.