A vibration that travels through earth carrying the energy released during an earthquake
The force exerted on a surface divided by the area over which the force is exerted.
The layer of rock that forms Earth's outer surface
A dark, dense, igneous rock with a fine texture, found in oceanic crust
A usually light colored igneous rock that is found in continental crust
The layer of hot, solid material between Earth's crust and core
A rigid layer made up of the uppermost part of the mantle and the crust
The soft layer of the mantle on which the lithosphere floats
A layer of molten iron and nickel that surrounds the inner core of Earth
A dense sphere of solid iron and nickel at the center of Earth
How have geologists learned about Earth's inner structure?
Geologists have used two main types of evidence to learn about Earth's interior: direct evidence from rock samples and indirect evidence from seismic waves.
What are the characteristics of Earth's crust, mantle, and core?
The tree main layers of Earth are the crust, the mantle, and the core. These layers vary greatly in size, composition, temperature, and pressure.