OTHER GEOLOGIC HAZARD

• ground subsidence - It is a phenomenon wherein the land gradually or suddenly sinks caused by excessive water extraction below the ground, and nature cannot sustain replenishing the water quickly.
• National Mapping Resource Information Authority - NAMRIA
• Caloocan, Malabon, Navotas, Valenzuela - CAMANAVA
• Ground subsidence usually occurs in urban cities, and many scientists consider it anthropogenic.
• Dissolution, cover-subsidence, cover-collapse, human-induced sinkholes - types of sinkholes
• Rainfall-induced landslide - downslope movement of soil, rock, and other organic materials due to gravity and landform
• Morphological, geological, human - factors that influence rainfall-induced landslide
• water (rainfall), seismic, volcanic activity - causes of rainfall-induced landslide
• fall, topple, slide, flow, spread - 5 major types of landslides
• fall - begins when the material on cliffs or steep slopes loses support or becomes fractured from the main rock.
• topple - happens when a block of material is detached from a steep slope, such as a cliff, and moves forward and downward in a rotating motion
• slide - occurs when detached mass of rocks, soil, and other organic matters moves along a downward-sloping surface
• flow - occurs when materials from gentle slopes are detached and flow like a viscous liquid along a surface
• spread - It occurs when the mass of soil or rocks extends or spreads laterally.
• Coastal Erosion - It involves breaking and removing materials from the coastline due to wave action, tidal currents, and human activities.
• bioerosion, mass movements, mechanical erosion of wave, weathering - types of coastal erosion
• lithology of rocks, global sea level rise, man-made interventions, climate - factors that influence coastal erosion
• Bolide - a generic term that defines celestial bodies entering the earth's

  surface, creating a fireball.
• Superbolide - is the term used to describe a relatively larger bolide.
• Near-Earth Objects - define the rocky or metallic asteroids and icy comets between Jupiter and Mars.
• climate change and sea level change - one of the hazards of bolide
• fireball - a very bright meteor that has the same magnitude (-4) as venus in the night and morning sky
• bolide - special fireball that explodes in the atmosphere with a bright flash before impacting the earth
• The Philippines is located in the Pacific Ring of Fire and the typhoon

  belt making it one of the most hazard-prone countries in the world.