Hazardous Earth Flashcards
What are the four major layers of the Earths structure?
Crust,Mantle,inner core,outer core
Which Earth layer is the thickest?
Mantle
Which two layers of the Earth are entirely solid?
Crust,Inner core
What type of earths crust in more dense? Why is this significant?
Oceanic crust. Significant because when a Oceanic and continental crash together it subducts.
What are the two types of Earth crust?
Continental and Oceanic
What is the name of the process that causes the Earths tectonic plates to move?
Convection currents
How many different types of plate boundary are there?
3
What direction do the plates move in at a convergent plate boundaries?
Towards each other
True or False? Volcanoes occur at conservative plate boundaries.
False
explain two characteristics of a shield volcano.
Tall. Narrow base.
explain two characteristics of a composite volcano.
Low. Wide base.
What is a hotspot?
an area of the Earth’s mantle from which hot plumes rise upward, forming volcanoes on the overlying crust.
complete the following sentence:
In an earthquake,the point of rupture-where the earthquake happens underground-is called the f_____. Shock waves radiate out from this point. The e________ is the point directly above this on the Earth’s surface (where the earthquake is felt the most).
Fault.
Epicentre.
What does magnitude mean?
The size of the eathquake
What is the name of the scale that earthquakes are measured on?
seismometer
