Plate tectonicts

4. Boundary: Where two plates move away from each other.
6. Boundary: Where two plates slide past each other horizontally.
8. The rigid outer part of the earth, consisting of the crust and upper mantle, which is broken into tectonic plates.
12. The supercontinent that existed millions of years ago, from which the current continents broke apart and drifted.
13. (the rigid outer layer of the Earth), asthenosphere (the soft, pliable layer of the mantle), and tectonic plates (large slabs of the lithosphere) that move on the asthenosphere. The movement is driven by convection currents in the mantle, and major geological features and events like mid-ocean ridges, ocean trenches, subduction zones, faults, and volcanoes result from the interactions at plate boundaries: convergent, divergent, and transform.
15. Tectonics: The scientific theory that Earth's outer shell is divided into several plates that glide over the mantle.
16. concepts
18. Occurs when one plate sinks beneath another, often creating a trench and volcanic activity.
20. Building: Occurs when continental plates collide and are uplifted.
21. features and events

1. Boundary: Where two plates move toward each other.
2. A break in the Earth's crust where movement occurs, which can cause earthquakes.
3. of Fire: A major belt of volcanoes and earthquakes surrounding the Pacific Ocean.
5. Currents: The circular motion of the mantle's hot, less dense material rising and cooler, denser material sinking, which drives the movement of tectonic plates.
7. Valley: A valley formed on land when continental plates pull apart.
9. of plate boundaries
10. Spreading: Creates new oceanic crust at mid-ocean ridges as plates diverge.
11. An opening in the Earth's crust through which molten rock, ash, and gases escape.
14. Trench: A very deep valley on the ocean floor, usually formed at a subduction zone where an oceanic plate sinks beneath another.
16. Drift: The theory that the continents were once joined and have since drifted apart.
17. Ridge: A long, underwater mountain chain, typically a divergent boundary where new oceanic crust is formed.
19. The soft, ductile layer of the upper mantle on which the tectonic plates move.