1. a long line of sea floor mountains where new ocean crust is formed by volcanic activity along a divergent boundary.

• mid-ocean ridge
• Asthenosphere
• continental drift
• convection current
• convergent boundary

2. the layer of Earth made up of the crust and the rigid rock of the upper mantle.

• lithosphere
• Asthenosphere
• continental drift
• convection current
• convergent boundary

3. a boundary along which two tectonic plates push together.

• convergent boundary
• Asthenosphere
• continental drift
• convection current
• crust

4. a deep valley formed as tectonic plates move apart, such as along a mid-ocean ridge

• rift valley
• Asthenosphere
• continental drift
• convection current
• convergent boundary

5. a boundary along which two plates scrape past each other.

• transform boundary
• Asthenosphere
• continental drift
• convection current
• convergent boundary

6. the layer in Earth's upper mantle directly UNDER the lithosphere

• Asthenosphere
• continental drift
• convection current
• convergent boundary
• crust

7. a circulation pattern in which material is heated and rises in one area, then cools and sinks in another area.

• convection current
• Asthenosphere
• continental drift
• convergent boundary
• crust

8. the layer of Earth between Earth's outer core and crust; the thickest layer

• mantle
• Asthenosphere
• continental drift
• convection current
• convergent boundary

9. one of the large moving pieces into which Earth's lithosphere is broken and which commonly carry both oceanic and continental crust.

• tectonic plate
• Asthenosphere
• continental drift
• convection current
• convergent boundary

10. a boundary along which two tectonic plates move apart.

• divergent boundary
• Asthenosphere
• continental drift
• convection current
• convergent boundary