Third Written Test in Science 10

Which of the following will occur if there is continuous grinding of plates against each other?

• earthquake

• rift valleys

• magma formation

• volcanic eruption

The following geologic events are indications that the crust is spreading except:

• earthquake

• oceanic ridges

• rift valleys

• trench

What is formed when there is convergence of two continental plates?

• island

• mountain

• trench

• volcano

What geologic event is most likely to happen at the given type of plate boundary on Figure 1 below?

• earthquake

• mountain ranges

• rift valleys

• volcanic arcs

What is expected to be found parallel to a trench when there is convergence of two oceanic plates?

• hot spot

• oceanic ridge

• rift valleys

• volcanic arc

Which of the following processes will most likely to happen upon continuous separation of plates?

• The molten material will rise to the surface creating a volcanic island arcs.

• No trench, volcanoes and islands instead mountain ranges are created.

• There is formation of trenches that will become source of earthquakes.

• There is formation of new material from the mantle to fill the gap.

Based on the given figure below, what will happen to Plate A as it continues to move downward?

• Plate A creates zone of tension below the mantle and give rise to mountain ranges and archipelagos.

• Plate A undergoes subduction and will melt forming magma that will rise and reaches the crust again.

• Plate A will create occasional shallow earthquakes at varying depths with a focal range of 60-300 km.

• Plate A gives rise to the formation of volcanic arcs near the edge of continental plate.

Which of the following best describes the process of subduction?

• The plate that goes downward can cause earthquake at varying depths where the focus is within 60 km.

• The denser oceanic crust collides with continental crust in which it bends towards the mantle.

• It allows the rise of the magma to reach the crust causing volcanic activity in the surface.

• Since the mantle is hotter than the crust, the subducted crust melt forming magma.

When two tectonic plates collide, why does oceanic crust usually subduct beneath the continental crust?

• Oceanic crust is less dense than continental crust.

• Oceanic crust is denser than continental crust.

• Oceanic crust is thicker than continental crust.

• Oceanic crust is thinner than continental crust.

What would result if a spreading center of a divergent plate develops within a continent?

• It could create ocean waves with a very long wavelengths large-scale disturbances of the ocean.

• The constant movement induces frequent to strong earthquakes.

• The crust may break into several segments.

• Trenches are formed.