b. Figure 1, located at the end of this document, shows Historic Earthquake Seis

Question

b. Figure 1, located at the end of this document, shows Historic Earthquake Seismicity along a portion of the Mariana Trench. You should note that not all the earthquakes occur at the same depth. Which of the following accurately states the relationship with earthquake depth and their relationship to the trench and the volcanic island arc? Circle one. (1pt) The earthquakes are directly on top of one another showing something subducting straight into the Earth The earthquakes are shallowest at the volcanic arc (red line) and get deeper toward the trench (pink line) The earthquakes are shallowest at the trench (pink line) and get deeper toward the volcanic arc (red line). There is no pattern to the earthquakes. Shallow, intermediate and deep earthquakes simply occur randomly around the trench and volcanic arc combination. 1. 2. 3. 4. The Earth's crustal thickness is an average of 35-70km thick. The green, blue, pink and purple earthquakes shown in the picture should all be occurring within Earth's mantle. The mantle is a pseudo plastic solid that should not break and should therefore not generate earthquakes. What is it that scientists theorize is breaking as it subducts down into the mantle? Circle one (1pt) c. 1. The trench 2. Ocean crust 3. Continental crust 4. The volcanic arc 5. The mid ocean ridge

Explanation / Answer

1 . Answer is option c) because from the scale it is known that red represnts highest depth where as yellow lowest. so Earthquake are deeper toward the volcanic arc.

2.Answer is -oceanic crust .Beacause it is denser in character.

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