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A Learning Tank 6: Choose the letter of the best answer and write your answer on a separate sheet of paper. 1. Whieb layer of the earth contains rocks that are moving slowly but continuously? A Crust B. Mantle C. Inner core D.Outer core 2. What happens to the P-waves when they are approaching the molten part of the Earth's interior? A become slower C. they disappear B. remains the same D. the velocity increases 3. What do you call the region on Earth's surface where a violent earthquake is felt? A. Crust B. Epicenter C. Focus D. Plate tectonic of the following seismic waves detected first by the seismograph? A. L-waves B. P-waves C. R-waves D. S-waves 4. Which 5. Which government agency in the Philippines monitors the earthquake? A. DOST B. DENR C. NDRRMC D. PHIVOLCS 6. Which part of the Earth is said to be solid? A. Crust B. Mantle C. Inner Core D. Outer Core VOT 4A CALABARZON Science G8 22
The mantle is almost entirely solid rock, but it is in constant motion, flowing very slowly.
Seismic waves move more slowly through a liquid than a solid. Molten areas within the Earth slow down P waves and stop S waves because their shearing motion cannot be transmitted through a liquid. Partially molten areas may slow down the P waves and attenuate or weaken S waves.
The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks.
The P wave is designated the primary preliminary wave because it is the first to arrive at a seismic station after an earthquake. It travels at a speed usually less than 6 kilometers per second in the Earth's crust and jumps to 13 kilometers per second through the core.
The Philippine Institute of Volcanology and Seismology is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis
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