1.a.)Which boundary is referred to as the Mohorovicic discontinuity (or Moho): c

Question

1.a.)Which boundary is referred to as the Mohorovicic discontinuity (or Moho):

crust - upper mantle

none of the above

lithosphere - asthenosphere

outer core - inner core

upper mantle - lower mantle

b.)Which rate of lithosphere movement is most possible:

5 cm/yr

5,000 cm/yr

50 cm/yr

500 cm/yr

c.)Which type of plate tectonic boundary forms the mid-ocean ridge?

ocean-ocean divergent boundary

continental-continental convergent boundary

hot spot

subduction zone

transform boundary

d.)Ocean trenches form at which plate tectonic boundary?

transform

divergent

none of the above

continental collisions

subduction zones

e.)What is the maximum depth (approximately) of an earthquake associated with a subduction zone?

1 km

30 km

250 km

670 km

2900 km

Explanation / Answer

A. The boundary surface referred to as the Mohorovicic discontinuity (or Moho) is in between the earth's crust and the mantle which is lying at a depth of about 10–12 km under the ocean and 40–50 km under the continents.

B. 5 cm/yr rate of lithosphere movement is most possible. It is the average speed of lithosphere plate movement.

C. Ocean-ocean divergent boundary plate tectonic boundary forms the mid-ocean ridge. Divergent plate boundary forms when two oceanic plates moves away from each other.

D. Ocean trenches form at subduction zones plate tectonic boundary. It forms where one plate subduct beneath another plate.

E. 670 km is the maximum depth (approximately) of an earthquake associated with a subduction zone. It is known as benioff zone.

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