1. What are the three types of plate boundaries?
CONVERGENT, DIVERGENT TRANSFORM
2. Draw a picture and describe a divergent boundary.
SHOULD DRAW A PICTURE OF TWO BOXES WITH ARROWS POINTING AWAY FROM EACH OTHER; AT A
DIVERGENT BOUNDARY THE PLATES SEPARATE OR MOVE AWAY FROM EACH OTHER; SEAFLOOR SPREADING
OCCURS AT A DIVERGENT BOUNDARY AT A MID OCEAN RIDGE
3. Draw a picture and describe a convergent boundary.
SHOULD DRAW A PICTURE OF TWO BOXES WITH ARROWS POINTING TOWARDS EACH OTHER; AT A
CONVERGENT BOUNDARY THE PLATES MOVE TOWARDS EACH OTHER OR COLLIDE; THERE ARE 3 DIFFERENT
CONVERGENT BOUNDARIES: OCEANIC-OCEANIC, OCEANIC-CONTINTENTAL, CONTINENTAL-CONTINENTAL;
SUBDUCTION OCCURS AT CONVERGENT BOUNDARIES CREATING TRENCHES AND VOLCANOES
4. Draw a picture and describe a transform boundary.
SHOULD DRAW A PICTURE OF TWO BOXES WITH ONE ARROW POINTING UP AND ONE POINTING DOWN; AT
TRANSFORM BOUNDARIES THE PLATES SLIDE PAST EACH OTHER OR MOVE PAST EACH OTHER IN OPPOSITE
DIRECTIONS; TRANSFORM BOUNDARIES CAUSE EARTHQUAKES AND FAULTS; REMEMBER: THE SAN ANDREAS
FAULT IN CALIFORNIA
5. Sea-floor spreading occurs at what type of plate boundary? ___ DIVERGENT ___
6. The longest chain of mountains in the world was discovered when scientists mapped the ocean floor suing what instrument? _______ SONAR (REMEMBER: HARRY HESS) ______
7. Continental crust is made of __ GRANITE __ while oceanic crust is made of __ BASALT ___.
8. What are the 3 types of convergent plate boundaries? Describe what happens at each.
OCEANIC OCEANIC: THE OLDER, DENSER PLATE SUBDUCTS CREATING A TRENCH
OCEANIC CONTINENTAL: THE OCEANIC PLATE SUBDUCTS BECAUSE IT IS DENSER, CREATING A TRENCH
CONTINENTAL CONTINENTAL: NO SUBDUCTION OCCURS; THE TWO PLATES COLLIDES AND CRUMPLE
CREATING MOUNTAINS (EX: HIMALAYAS CREATED BY INDIA COLLING WITH ASIA)
9. ___ SUBDUCTION ___ occurs when old oceanic crust is forced back into the mantle.
10. Where is new oceanic crust being formed? __ AT MID OCEAN RIDGES (SEA- FLOOR SPREADING) _____

11. Oceanic trenches can be found at what type of plate boundary? ____ CONVERGENT _____
12. As you move farther away from the Mid-Atlantic Ridge, what happens to the age of the rocks?
THE ROCKS/CRUST GET OLDER (THE YOUNGEST OR NEWEST ROCKS ARE RIGHT AT THE MID OCEAN RIDGE
13. Earthquakes are generated at what type of plate boundary? _____ TRANSFORM __________
14. What is the largest tectonic plate? ___ PACIFIC ________
15. Describe what happens at a continental-oceanic convergent boundary.
THE OCEANIC PLATE WILL SUBDUCT UNDER THE CONTINENTAL PLATE BECAUSE OCEANIC CRUST IS DENSER.
THE OCEANIC PLATE WILL THEN MELT, TURN INTO MAGMA, AND WHEN ENOUGH MAGMA REACHES THE
SURFACE, IT ERUPTS AS VOLCANO
16. Describe the process of sea-floor spreading.
17. Volcanoes are created at what type of plate boundary? ____ CONVERGENT _______
18. Subduction occurs at what type of plate boundary? ___ CONVERGENT _______
19. Where can you find the youngest rocks on the ocean floor? ____ AT THE MID OCEAN RIDGE _____
20. Where can you find the oldest rocks on the ocean floor? ____ FARTHEST FROM THE RIDGE; NEAR THE
EDGES OF CONTINENTS ___
21. What boundary is number 1 pointed to? __ (POINTING TO FAULTS) IT’S A TRANSFORM BOUNDARY __

22. What feature of a convergent boundary is shown in number 2? ___ TRENCH _____
23. What kind of convergent boundary is shown in number 3? ____ OCEANIC-OCEANIC ______
24. Subducted plates sink into what physical layer of Earth? __ ASTHENOSPHERE _____
25. Convection currents flow in the ___ ASTHENOSPHERE ___. (hint: a physical layer of the earth), and are what cause the movement of the tectonic plates.
26. The Richter Scale measures earthquakes.
Other things to review:
COMPOSITIONAL LAYERS IN ORDER: CRUST, MANTLE, OUTER CORE, INNER CORE
PHYSICAL LAYERS IN ORDER: LITHOSPHERE, ASTHENOSPHERE, MESOSPHERE, OUTER CORE, INNER CORE
7 STEPS OF THE SCIENTIFIC METHOD: PROBLEM, HYPOTHESIS, MATERIALS, PROCEDURE, DATA & OBSERVATION,
ANALYSIS, CONCLUSION