| A | B |
|---|
| I am the middle layer of the Earth, between the crust and the core. | mantle |
| I am the outermost, thinnest, and most solid layer of the earth. | crust |
| I am the solid center of the earth. | inner core |
| I am the liquid layer of the core. | outer core |
| I am the preserved remains of an ancient plant or animal. | fossil |
| I am the boundary of the Earth's plates. | fault |
| I am the theory that the Earth's surface changes due to convection currents in the mantle. | Plate tectonics |
| I am a boundary where the Earth's plates come together. Mountains or volcanoes form here. | convergent boundary |
| I am a boundary where the Earth's plates separate. Mid-ocean ridges form here. | divergent boundary |
| I am a boundary where the Earth's plates move horizontally past each other. Earthquakes occur here. | sliding boundary |
| I am the slow movement of the Earth's landmasses across the Earth's surface. | continental drift |
