Natural Hazards Flashcards

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1
Q

name 3 natural hazards at plate boundaries

A
  1. earthquakes
  2. volcanoes
  3. tsunamis
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2
Q

name this plate boundary

A

conservative plate boundary

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3
Q

describe a conservative plate boundary

A

two parallel plates move alongside each other

  1. in opposite directions
  2. in the same direction at slightly different speeds
  3. causing friction until they suddenly slip past and the rock snaps
  4. causing shockwaves (seismic waves) to shake the ground
  5. producing an EARTHQUAKE
  6. example: San Andreas Fault near Los Angeles
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4
Q

name this plate boundary

A

destructive plate boundary

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5
Q

what happens at a destructive plate boundary

A

an oceanic plate and a continental plate move towards each other and collide

  1. the heavier oceanic plate is forced underneath the lighter continental plate
  2. the friction causes the heavier oceanic plate to melt and become magma
  3. creating EARTHQUAKES (collsion) AND VOLCANOES (magma escaping) = TOTALLY DESTRUCTIVE!
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6
Q

name this plate boundary

A

constructive plate boundary

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7
Q

what happens at a constructive plate boundary

A

two plates move apart in opposite directions

  1. convection currents cause plates to move apart
  2. magma rises to fill the new gap
  3. on the surface, the ‘lava’ hardens to form new mountains/islands and VOLCANOES
  4. example: mid-Atlantic Ridge
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8
Q

name this zone

A

collision zone

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9
Q

what happens at a collision zone

A

two continental plates collide

  1. as both plates are the same weight, neither plate is forced under the other
  2. instead both plates are forced up to form fold mountains
  3. example: Himalayas (Asia), Andes (South America), Alps (Europe)
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10
Q

where are earthquakes likely to happen?

A

conservative (sliding parallel)

&

destructive (sliding under)

plate boundaries

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11
Q

where are volcanoes likely to happen?

A

at constructive** & destructive plate boundaries**

where there’s magma

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