The earth's structure, tectonic plates and plate boundaries Flashcards
What are the four layer of the earth called
Crust, mantle, outer core, inner core
How hot is the inner core
5500°C
Which plate type is heavier
Oceanic or continental
Oceanic
What is the movement of plates called
continental drift
What is the outer core made of
Liquid metal
What is the mantle made of
Semi-molten rock called Magma
What caused the movement of plates
Convection currents
What are the edges of plates called
Plate boundaries
What happens at a constructive plate boundary, movement wise
Two plates Move apart from each other
⬅️↔️➡️
Why does magma rises to the surface
Because gas bubbles in the magma make it lighter than surrounding rock
What are formed at a constructive plate boundary
Volcanoes
Where are most constructive plate boundaries
Under the sea
Name a famous constructive plate boundary
The mid Atlantic ridge
What happens at an destructive plate boundary, movement wise
An oceanic and a continental plate collide
➡️➡️⬅️⬅️
↘️
↘️
At a destructive plate boundary which plate sinks under neath the other, and why
The oceanic plate sinks under the continental plate because it is heavier
What is the subduction zone
The heavier oceanic plate sinks under the continental plate into what is known as a subduction zone
At a destructive plate boundary when the melted crust rises,what does this form
It forms dangerous, explosive volcanos
When two plates rub together this causes friction, what does this cause
Earthquakes
What is the most famous destructive plate boundary
The ring of fire
Do destructive plates boundaries cause volcanos or earthquakes
Both, volcanos and earthquakes
What happens at a conservative plate boundary, movement wise
The two plates slide past each other
➡️➡️➡️➡️➡️
⬅️⬅️⬅️⬅️⬅️
At a conservative plate boundary if the plates get locked what happens
The tension will build up over years and suddenly they will jolt past each other causing a major earthquake
True or false :
Volcano are common at conservative plate boundaries
False, volcano do not happen at conservative plate boundaries
Name a famous conservative plate boundary
San Andreas fault
What happens at a collision plate boundary, movement wise
Two continental plates push together
↗️↖️ ➡️➡️ ⬅️⬅️
True or false :
at a collision plate boundary nether of the plates sink beneath the other as they are both made of light rock
True
When the two plates buckle at a collision plate boundary they form what
Fold mountains
True or false :
At a collision plate boundary volcanic activity does not occur
True
What the most famous landform formed by a collision plate boundary
The Himalayas
The is the area called where the earthquake starts
The focus, it is underground
What is an epicentre
It is directly above the focus, on the earth surface.
