natural hazards and tectonuc plates

Question 1

what is a natural hazard

Answer 1

when a natural event has the possibility of harming human life and/or property

Question 2

natural disaster

Answer 2

when a natural hazard actually happens and causes significant damage to a vulnerable population

Question 3

natural event

Answer 3

a naturally occuring physical occurance

Question 4

what are the two types of hazards

Answer 4

geophysical and hyrdrometeorological

Question 5

what is a geophysical hazard

Answer 5

a hazard that occurs due to the movement of tectonic plates

Question 6

What is a hydrometeorological Hazard?

Answer 6

A hazard involving water and weather systems

Question 7

Give some examples of geophysical hazards

Answer 7

Floods, droughts, heatwaves , tropical storms, such as typhoons hurricanes in cyclones storms and wildfires

Question 8

What are the factors affecting hazard risk?

Answer 8

Time location, frequency, magnitude type of Hazard, population, government, wealth 

Question 9

What state are the four layers of the Earth? 

Answer 9

The inner core is solid. The outer core is liquid. The mantle is semi solid and the crust is solid.

Question 10

What are convection currents?

Answer 10

1. Radioactive decay in the cool causes magma in mantle to heat up
2. It rises as the density decreases
3. When it reaches the crust, it moves away from the heat and spreads out, and then cools down and sinks backed down 
4. The convection cycle continues

Question 11

What is slab pull

Answer 11

Slab pull is when two plates meet, and one sinks under the other, the slab pull causes the rest of the plate to go down

Question 12

which type of crust is thinner and denser

Answer 12

oceanic is thinner and denser than continental

Question 13

what happens at a constructive boundary

Answer 13

plates move away from each other and new crust is formed as magma rises

Question 14

what are the hazards at constructive boundaries

Answer 14

The hazards are shield volcanoes and undersea volcanoes. there are also earthquakes due to the gentle extension, but they are not very severe

Question 15

what is formed at constructive boundaries

Answer 15

ridges and islands

Question 16

describe what happens at destructive subduction boundaries

Answer 16

the denser plate subducts under the less dense plate. This is usually the oceanic plate under the continental plate, but subduction also happens when there are two oceanic plates. Subducting plates pulled into the mantle by slab pull. As the plate subducts, it melts due to friction and high temperatures

Question 17

what are the hazards at destructive boundaries

Answer 17

Composite volcanoes are created at destructive boundaries. The subduction involves collision and friction, so causes very severe earthquakes.

Question 18

What is created at destructive boundaries?

Answer 18

trenches are created. oceanic plate being forced onto another oceanic plate makes island arcs. when the continental plate buckles upwards mountains are made

Question 19

describe what happens in a destruction collision boundary

Answer 19

between two continental plates. both move upward and make fold mountains. rift valleys also created

Question 20

what is a conservative boundary

Answer 20

when two plates slide past each other in opposite directions or differnt speeds. nothing is created or destroyed

Question 21

hazards at conservative boundaries

Answer 21

moderate earthquakes but close to the surface. no volcanoes