Question

1. a tectonic plate consists of__ a. the crust and uppermost mantle b. the oceanic and continental crust only c. the crust and entire mantle d. the asthenosphere only 9. what kind of plate - boundary occurs where two plates grind past each other without destroying or producing lithosphere? a. divergent boundary b. convergent boundary c. transitional boundary d. transform - fault boundary 10. what type of boundary occurs where two plates move together, causing one plate to descend into the mantle beneath the other plate? a. transform - fault boundary b. divergent boundary c. convergent boundary d. transitional boundary 11. which of the following is a geographic example of a transform - fault boundary? a. the east african rift valley b. the san andreas fault c. the mid - atlantic ridge d. the andes mountains 12. new ocean crust is formed at a. divergent boundaries b. convergent boundaries c. continental volcanic arcs d. transform - fault boundaries 13. which of the following results when divergence occurs between two oceanic plates? a. seafloor spreading b. a subduction zone c. an ocean trench d. a volcanic island arc 14. deep ocean trenches are associated with__ a. ocean ridge systems b. subduction zones c. transform - fault boundaries d. rift zones 15. volcanic island arcs are associated with what type of plate boundary? a. divergent boundary b. convergent continental - continental boundary c. convergent oceanic - continental boundary d. convergent oceanic - oceanic boundary 16. the himalayas in south asia is an example of what type of plate boundary? a. convergent oceanic - continental boundary b. convergent continental - continental boundary c. divergent boundary d. transform - fault boundary

Explanation:

• A tectonic plate consists of the crust and uppermost mantle. This is the definition of a tectonic plate.
• When two plates grind past each other without destroying or producing lithosphere, it's a transform - fault boundary. This is the characteristic of a transform - fault boundary.
• When two plates move together and one plate descends into the mantle, it's a convergent boundary. This is the nature of a convergent boundary.
• The San Andreas Fault is a well - known example of a transform fault boundary.
• New ocean crust is formed at divergent boundaries due to the upwelling of magma.
• Seafloor spreading occurs when divergence happens between two oceanic plates.
• Deep ocean trenches are associated with subduction zones where one plate is forced beneath another.
• Volcanic island arcs are associated with convergent oceanic - oceanic boundaries as a result of subduction and volcanic activity.
• The Himalayas are an example of a convergent continental - continental boundary where two continental plates collide.

Answer:

1. a. the crust and uppermost mantle
2. d. transform fault boundary
3. c. convergent boundary
4. b. the San Andreas Fault
5. a. divergent boundaries
6. a. seafloor spreading
7. b. subduction zones
8. d. convergent oceanic - oceanic boundary
9. b. convergent continental - continental boundary