Senior High School Grade 11 Learning Material

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Senior High School Grade 11 Learning Material




Learners' Material for




  • Disaster Readiness and Risk Reduction (Summary/Reviewer) Here

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DRRR Part 3

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DRRR Part 11

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Activity: Types of Earthquake Hazards GROUND RAPTURE 1. When does ground rapture occur?      Ans: when movement on a fault breaks through the surface, occurs suddenly during as earthquake, slowly in the form of fault creep 2. Where does rapture follow? Why?      Ans: in preexisting faults due to weakness of that zone GROUND SUBSIDENCE 1. Define ground subsidence.     Ans: ground subsidence is the lowering of the land surface 2. What are the factors that causes ground subsidence?      Ans: sinkhole, underground mine collapse, major earthquake LIQUEFACTION 1. Describe liquefaction.      Ans: liquefaction is a phenomenon whereby a saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress 2. What causes soil liquefaction?      Ans: earthquake or other sudden changes in stress condition, causing it to beh...
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DRRR Part 13

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Disaster Readiness and Risk Reduction (DRRR) 13. Volcanic Hazards Volcanic Hazards and their Differences a. Lahar      -mixtures of volcanic water and rock fragments which rush down the slopes of a volcano and into the surrounding valleys b. Ash Fall      - consists of tiny jagged particles of rock and natural gas blasted into the air by a volcano c. Pyroclastic Flow      - (pyroclastic density current) a fast moving current of hot gas and rock moving away from the volcano with the speed of 700 km/h or 450 mph d. Ballistic Projectile      - rocks that an erupting volcano may hurl into the air      - these blocks and bombs travel like cannon balls and usually land within 2 km of the vent      - can travel as far as 5 km or even further if the eruption is very explosive e. Volcanic Gases      - gases such as sulfur dioxide (SO2) and hydrogen s...
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