2. Earthquakes send waves of energy through rocks inside Earth.
3. Meteorites formed a long time ago in the early solár
system.
4. Earth's crust is made of solid rock.
5. Lava flows formed the oceanic crust.
6. The continental crust contains only igneous rock.
7. Heat travels from the top to the bottom of the mantle.
8. Earth's core is very dense.
9. Convection currents occur in the inner core.
10. Plate tectonics is the theory that the lithosphere is divided
into plates that move over Earth's surface.