Chapter 2 Flashcards
How did heat transform early earth
Decay of radioactive isotopes
Impact energy
Gravitational energy
Massive amount of heat produced widespread melting that caused the formation of
Large ocean
Dense atmosphere
Primitive crust
What is the earths layers based on
Density due to different chemical and mineral composition
What does the earths core consist of
Inner and outer core
Name the crust different crust
Lithosphere
Asthenosphere
Mesosphere
Define mesosphere
Stiff plastic sold that extends from the core
Asenthosphere
soft plastic that surrounds the mesosphere
Lithosphere
Ridged outer layer
What doe lower density continents and mountains ranges do on the denser mantle below
Float
What type of rebound effects Canada
Post-glacial
Name one small and big plate
Pacific and Juan de fuca
What do tectonic forces form
Mountains/plateaus
Mid-ocean ridges
Deep ocean trenches
Chains of volcanic ridges
How may yes does it take to complete a tectonic cycle
250 million yrs
Where does magma rise
Asthenosphere
Where does magma surface
Oceanic volcanic ridges
What happens as magma cools
Plates move laterally away
Where do plates subduct and assimilate in the asthenosphere
When it grow thicker and collide with less dense plates
What do convection cells in mantle drive
Movement of the overlying tectonic plates
Name all the zones
Divergent
Convergent
Hot spots
Transform plate boundaries
Rifting
Some central area sages
Spreading
Advance pulling apart
What do plates do at convergent zones
Deform under pressure
What are the 3 classes of collisions
Oceanic plate - oceanic plate
Oceanic plate - continent plate
Continent plate - continent plate
Oceanic - oceanic convergenced
Formation of deep offshore teaches and sea floor volcanoes
Oceanic-continental convergence
Formation of a coastal tench and adjacent chains of volcanoes
What happened when Godwanaland began separating
India move northwards towards Asia
What are hot spots
Hot mantle rock rises up through the asthenosphere and lithosphere
When the lithosphere plates move what are formed
Volcanos
Shallow hypocentre
Earthquakes generates in brittle rocks in both subducting and overriding plates
