Layers of the Earth
What is the thinnest layer of the earth?
Crust
Who first presented the continental drift theory?
Alfred Wegner
What type of boundary creates new parts of the sea floor?
Divergent
What is lava
It is a mixture of magma and gases, including steam, carbon monoxide and hydrogen sulfide
What is the Earth's core mainly composed of?
Iron and Nickel
What layers make up the asthenosphere?
Crust and upper mantle
Why was Alfred Wegner's theory over looked?
There was no real proof
What type of boundary causes the sea floor to be destroyed?
Subduction
What are hot spots
Regions of the crust where the mantle below is extremely hot
What is the part labelled B on the doagram your teacher will shoe you?
Main Vent
What are the four layers of the Earth (both layers of the core)?
Crust, mantle, Inner core, Outer core
What type of boundary can commonly produce earthquakes?
Transform
What is subduction?
Plates move under each other to form a trench
What are extinct volcanoes?
Extinct volcanoes are those that have not erupted for thousands of years
What is the primary cause of volcanoes and earthquakes?
Crustal plate movement
What is the hottest layer of the Earth?
The core
What are the three sub-types of convergent plate boundaries?
Ocean-Ocean, Ocean-Continental, Continental-Continental
What type of boundary can produce volcanoes?
Convergent
What is the part labelled B on the diagram that your teacher will show you
Magma Chamber
What landform is created when two continental plates collide?
A mountain range
Other than the inner core what is the most solidified layer of the Earth?
Crust
Why does the oceanic crust get subducted below continental crust?
The oceanic crust is denser
What is plate tectonics?
The theory that the plates move on convection currents
What is the part labelled H on the diagram your teacher will show you?
Volcanic Bombs
What is the most recent super continent that Alfred Wegner explained in his theory?
Pangea