Question

base your answers to questions 10 and 11 on the cross section below and on your knowledge of earth science. the cross section represents a section of earths lithosphere along the coast of japan. the epicenter of a large magnitude earthquake that occurred on march 11, 2011 is indicated. devastation occurred mainly in the low-lying coastal areas of japan closest to the epicenter. letter a represents a geologic feature.
image of cross section showing japan, sea of japan, pacific ocean, oceanic crust, magma, melting crust, earthquake epicenter, and feature a
(not drawn to scale)
10 the geologic feature indicated by letter a is
(1) an igneous intrusion (3) an ocean trench
(2) an island arc (4) a hotspot
11 which type of tectonic plate boundary is represented in the cross - section?
(1) transform (2) complex (3) convergent (4) divergent

1. the aerial photograph below shows two streams that have been displaced by tectonic movement along the san andreas fault. the arrows show the relative direction of movement along the fault.

image of aerial photograph showing streams displaced by san andreas fault
this movement occurred along which type of plate boundary?
(1) divergent (2) convergent (3) transform (4) complex

Explanation:

Question 10

To determine the geologic feature \( A \), we analyze the cross - section. An ocean trench is a deep depression in the ocean floor formed at convergent plate boundaries where an oceanic plate subducts. In the given cross - section, the feature at \( A \) is consistent with an ocean trench (formed as the Pacific plate subducts under the Japanese plate). An igneous intrusion is a body of igneous rock formed within the crust, an island arc is a chain of volcanic islands (like Japan itself, not the feature at \( A \)), and a hotspot is a stationary source of magma (not related to this subduction zone).

The cross - section shows one oceanic plate (Pacific) subducting under another plate (containing Japan). Convergent plate boundaries are where plates move towards each other, and subduction is a key process at convergent boundaries (especially ocean - continental or ocean - ocean). Transform boundaries involve sliding past each other, divergent boundaries involve moving apart, and “complex” is not a standard plate boundary type.

The San Andreas fault is a well - known transform plate boundary. Transform boundaries are where two tectonic plates slide horizontally past each other. Divergent boundaries have plates moving apart, convergent have plates moving together, and “complex” is not a standard plate boundary category. The displacement of the streams along the San Andreas fault is consistent with the sliding motion of a transform boundary.

Answer:

(3) an ocean trench

Question 11