25. Which type of plate boundary has an oceanic trench along it? a. Convergent b

Question

25. Which type of plate boundary has an oceanic trench along it? a. Convergent b. Divergent c. Transform d. All boundary types 26. Which feature below is a convergent boundary associated with? a. Flat topography b. Mantle upwelling c. Deep trench d. Mid-ocean ridge 27. What is the minimum number of earthquake seismic stations needed to determine the epicenter of an earthquake? C. b. 2 d. 4 28. The intensity of an earthquake a. b. c. d. Is variable depending on the distance to the epicenter. Doesn't change for an earthquake, no matter how far away it is. Is measured using the moment magnitude scale. Will be the same for all earthquakes having an identical magnitude. 29. Earthquake intensity varies with distance from the epicenter, but magnitude does not. a. True b. False

Explanation / Answer

25) Convergent plate boundaries has an oceanic trench along it. Convergent plate boundaries are plate boundary along which lithospheric plates move towards each other and subducted beneath another plate. It moves at rates that vary from a few millimeters to over ten centimeters per year. An oceanic trench is an important geomorphological feature of convergent boundaries which marks the position at which the flexed, subducted slab begins to descend beneath another plates. Those oceanic trenches are generally parallel to a volcanic island arcs.

26) Deep trenchs are associated with convergent boundary. Converging plate boundary is known as subduction plate boundary. Deep trenches are formed where tectonic plates are being subducted and earthquakes are common or deep trenches are formed in convergent boundary. Fluids are released from the subducted rock due to the sinking plate moves deeper into the mantle. As a result the overlying mantle to partially melt. So, The magma rises upward and may erupt violently to form volcanoes which form arcs of islands along the convergent boundary. Example: The Marianas Trench is formed by the convergence of two oceanic plates

27) Minimum number of earthquake seismic stations needed to determine epicenter of an earthquake is 3. Because triangular method for pointing epicenter require minimum 3 points.

28) The intensity of an earthquake is variable depending on the distance to the epicenter. Because intensity of an eartquake depends on degree of damage and destruction it can cause. So, the energy, released during earthquake decreases outward from the epicenter.

29) Earthquake intensity varies with distance from the epicenter, but magnitude does not. -True

Because magnitude of earthquake measures the energy which has been released at the source during earthquake.

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