Earthquakes and volcanic eruptions Flashcards
Three things that make the core hot
- Pressure (not enough space to become a gas of the molecules become angry)
-BIGBANG (collisions/lots of things hitting the Earth generated heat)
-Radioactiveness
What’s the continental drift?
Movement of continents
Describe the core
-It’s made from lead, iron and nickel, which are heavy base metals
-The core is very dense
-It’s so hot because of the huge amount of pressure there
What’s the mantle made of?
Molten rocks
What’s a convection current?
- The core heats the lower mantle
2 The top of the mantle as cold as it is further away from the core - The hot rocks expand because of the heat, which makes it less dense
- The cold rocks are more dense so fall to the bottom as the hot rocks rise
5 The cold rocks then heat up at the heat source and the cycle repeats
Describe the crust
The mantle affects the crust as it is fractured into tectonic plates and creates plate boundaries that can move a part of collide
Characteristics of a continental crust
-Older
- Less dense
-Cannot sink
Characteristics of an oceanic crust
- Newer
-More dense - Can sink
What are the two different types of crust?
Continental and oceanic
What are the different types of plate boundaries?
Conservative, constructive, destructive, collision zones
How does a Conservative boundary work?
Two plates move past each other in the same direction, but one moves slower than the other so they scrape against each other
Give an example of a Conservative plate boundary
San Andreas fault
How does a constructive plate boundary work?
Convection currents pull Two plates, apart, the sea, then fills the gap and underwater volcanoes can form 
Give an example of a constructive plate boundary
Mid-Atlantic ridge
How does a destructive plate boundary work?
A continental plate and an oceanic plate, push against each other, and the oceanic plate is subducted underneath the continental plate
How does a collision zone form?
Two continental plates push against each other forming fold mountains
What is an example of a collision zone?
Alps
What is an example of a destructive plate boundary?
The Chilie trench
What forms at a constructive plate boundary?
Volcanoes and earthquakes
What forms are destructive plate boundary?
Fold mountains, trenches, volcanoes, and earthquakes
What forms at a Conservative plate boundary?
Earthquakes
What forms at a collision zone?
Fold mountains, volcanoes and earthquakes
Explain why ocean trenches are often found a fold mountains, (4 marks)
Ocean trenches often found near fold mountains because ocean trenches are formed on destructive plate boundaries. They are formed when the oceanic plate is subducted under a continental plate and a V shape dip is formed under the ocean. Fold mountains are also formed at destructive plate boundaries when the continental plate is compressed, which forms fold mountains. However fold mountains also formed on collision zones, which means they’re not always next to oceanic trenches.
