1. Unit 1 Vocab Earth Science Unit

2. Continental crust
Rocky material that makes up continents; less dense than material of oceanic crust

3. Formed where two sections of Earth’s crust are colliding
Convergent boundary
Formed where two sections of Earth’s crust are colliding

4. Forms where lithosphere plates are moving away from each other
Divergent boundary
Forms where lithosphere plates are moving away from each other

5. Mid-ocean ridge
Undersea mountain range that forms where two parts of Earth’s crust are pushing apart. (Divergent plate boundary)

6. Oceanic crust
Earth’s outer crust that lies beneath the oceans, denser than the continental crust

7. The place where two lithosphere plates meet
Plate boundary
The place where two lithosphere plates meet

8. Sea-floor spreading
Theory that magma from Earth’s mantle rises to the surface at mid-ocean ranges and cools to form new seafloor, slowly pushing away from the ridge

9. Subduction zone
The process in which one lithosphere plate slides under another; occurs at converging plate boundaries

10. Tectonic plate
One of the pieces of Earth’s rocky crust that rests and moves on the semi-liquid mantle

11. Theory of plate tectonics
Describes plate movement and how movement affects Earth’s geologic features

12. Transform boundary
Boundary between two lithospheric plates where the plates are sliding past each other