The deep cracks are created by the movement of Earth's plates. It's confirmed: The largest deep earthquake ever recorded happened in May off the coast of Russia. It is light and brittle and can break. The leading hypothesis behind the breakup of the African continent is caused by an underlying. Splitting a continent in two is quite common, for instance, it led to the opening of the Atlantic Ocean. B Deep events occur in places other than where crustal plates meet. E The earthquake had a low peak intensity.
In relative terms, it's thickness is like that of the skin of an apple. Becky was a science reporter at Live Science and The Pasadena Star-News; she has freelanced for New Scientist and the American Institute of Physics. A Determining the depth of a well by dropping stones into the well and timing how long they take to reach the bottom B Determining the height of a mountain by measuring the shadow it casts at different times of the day C Determining the distance from a thunderstorm by timing the interval between the flash of a lightning bolt and the thunder it produces D Determining the distance between two points by counting the number of paces it takes to cover the distance and measuring a single pace E Determining the speed at which a car is traveling by timing how long it takes to travel a known distance C 5. Because P and S waves travel at different but fairly constant speeds, the interval between their arrivals increases in proportion to the distance from the earthquake focus, or rupture point. But this massive temblor is still a mystery to scientists.
When they sailed out in the Pacific Ocean in eastern Indonesia, they identified prominent landforms in the water that were formed by the Banda Detachment fault plane. D The speeds of both P and S waves are slightly greater than previously thought. The biggest faults mark the boundary between two plates. B Deep events occur in places other than where crustal plates meet. But the following lines suggest that in case of the less common earthquakes fracture doesent occur.
That's why it is, on average, so old. D Most researchers expected P waves to be slower than S waves. Tia Ghose, Senior Writer on. A Deep events are far less common than shallow events. The incompatible elements that end up in the continents are important because they include the major radioactive elements , thorium, and potassium. She earned a master's degree in geology from Caltech, a bachelor's degree from Washington State University, and a graduate certificate in science writing from the University of California, Santa Cruz.
C The earthquake focus was distant. Basaltic rocks contain more silicon and aluminum than the peridotite left behind, which has more iron and magnesium. The deepest earthquakes occur on reverse faults at about 375 miles 600 km below the surface. C In shallow events the epicenter and the focus coincide. E The earthquake had a low peak intensity.
Wadati relied on a time difference between the arrival of primary P waves and the slower secondary S waves. C Mantle rock is more ductile at a depth of several hundred kilometers than it is at 50 kilometers - Incorrect D The speeds of both P and S waves are slightly greater than previously thought. A P waves originate at the focus and S waves originate at the epicenter. The method used by Wadati to determine the depths of earthquakes is most like which of the following? It's hard to understand how such an occurs at all under such huge pressure. The red part is a new approach related to his discoveries.
The passage supports which of the following statements about the relationship between the epicenter and the focus of an earthquake? Use MathJax to format equations. A P waves originate at the focus and S waves originate at the epicenter. Regards, The Crossword Solver Team If you have a moment, please use the voting buttons green and red arrows near the top of the page to let us know if we're helping with this clue. What is true is that their arrivals difference increases in proportion to the distance from the earthquake focus. Continents are truly permanent, self-sustaining features of the Earth's surface. It's not clear yet whether drilling should continue at the new hole or if another one should be started in the effort the reach the mantle. For question 3, other than A the only answer that might be right is C.
B The earthquake was a shallow event. The passage suggests which of the following about the views held by researchers before 1927? Off the coast of Japan is part of the crack that makes the western edge of the Pacific plate. Point A to B not as point A over B. Rock transformation Another possibility is that the main type of rock found at this depth, called , goes through a mineral transformation because of the enormous pressures it is under, which then triggers sliding between different types of rock. A prior deep earthquake, in Bolivia in 1994, was the same magnitude, but released less energy. However, everyone who talks about the crust, whether in seismological or petrological terms, fortunately, means the same thing.