Earthquakes
What is the starting point of an earthquake called?
epicenter
a measurement of how much magma will flow
Which of the following is NOT a warning sign of a landslide
a. heavy rain
b. total silence
c. cracks in the pavement or ground
d. objects on the slope start tilting
Why is it important to know the risk factors and warning signs of natural disasters?
So we can predict when and where they will happen and prepare for them
What causes a volcano to erupt?
Plate motion creates pressure under the surface
Along plate boundaries
What determines how explosive an eruption will be?
silica in the magma
Free 100 points
Yay
What is usually the cause of flooding?
HEavy and long lasting rain
What direction do plates move at a normal fault
What piece of data is needed to determine how far an city is from an epicenter?
Time in between the p and s waves
How does density of magma affect its movement?
Less dense magma rises to the surface
What is the cause of a landslide?
Gravity
True or false floods usually have many warning signs
false
what direction do the plates move at a strike-slip fault
past each other/ one forward one back
p waves are faster and move side to side, s waves are slower and move up and down
what is the difference between magma and lava?
lava is on the surface of the earth, magma is below the surface
What areas in the US are highest risk for a landslide?
Areas where earthquakes occur/ near mountains
Name two things that make an area higher risk for a flood
near bodies of water
etc
How many cities are needed to determine the epicenter of an earthquake?
3
Normal- plates are moving away from each other and get stuck
Reverse- plates are moving toward each other and get stuck
Strike-slip- plates are moving past each other and get stuck
hot spot- a thin area in the crust/ active area in the mantle
Why do trees/ plants prevent landslides?
Why does construction/ pavement make flood risk increase?
It cannot absorb water as quickly as the earth
Lose 10 points
L