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17 Cards in this Set
- Front
- Back
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Natural Hazard |
Any natural process that is a potential threat to human life and property. |
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Convergent Boundry |
➡️️⬅️ two plates : moving towards each other pushing/colliding together
constructive |
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Divergent Boundry |
⬅️➡️ two plates : move away frm each other
destructive |
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Transform Boundry |
two plates slide/move past each other in opposite directions |
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Subduction zone |
one plate moves under another a deep ocean trench is formed. |
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Fold Mountains |
Formed when two plates collide and force layers into fold |
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Syncline fold |
A downward fold in rock formed be compressions in Earth's crust. |
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Anticline fold |
An upward fold in rock formed by compression of Earth's crust. |
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Rift Valleys |
A valley with steep sides . When sectional of the crust extend along fault lines, tensional forces can cause a central block of land to subside between a pair of parallel faults, forming a rift valley. |
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Volcano |
Landform formed by magma ejected from the mantle onto the Earth's surface. |
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Magma Chamber |
A reservior of molten rock beneath the Earth's curst. |
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Calderas |
Formed when the summit of the volcano may be blown off during an explosive eruption The sides of a crater collapsed due to loss of structural support . .•. large depression |
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Shield Volcano |
A wide, gentle sloping mountain made of layers of lava and formed by quiet eruptions.
• Divergent plate
Eg. Mount Washington (USA) |
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Stratovolcano |
From successice eruptions of lava and pyroclasts (ash, rock fragments)
• Convergent plate
Eg. Mount Merapi (Ind) Mount Pinatubo (Phi) |
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Parcific Ring Of Fire |
Region where most active volcanic activity occurs.
Converging plates : Parcific, Nazca , Philippine , Australian & Eurasian
Divergent plates : Atlantic Ocean , East Africa
Not in Parcific ROF : 'Hot Spots' |
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5 Factor of Extent of Earthquakes |
1) Distance frm Epicentre
2) Type of Soil • Liquefaction occurs when soils are loose and unconsolidated, seismic waves are amplified.
3) Population Density ⬇️people in affected area ⬇️death toll vice versa
4) Time of Occurance Night Time : people are 😴, ⬆️ppl trapped, ⬆️death
5) Level of prepardness More manageable when ppl are better prepared for damage |
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Tsunamis |
unsually large seawaves
Occurance 1)Movements of seafloor during earthquakes 2)Explosive underwater volcanic eruption 3)Landslide above sea level & plunge into the water |
