Continental Drift
Who proposed continental drift?
Alfred Wegner
Who discovered that the seafloor was spreading?
Harry Hess
What is mass/volume?
Density
How many layers of the Earth are there?
4
What are 2 types of crust?
Continental & Oceanic
What landform or feature is found in the middle of the Atlantic Ocean?
Mid-ocean ridge
What did he notice about the shapes of the continents?
They fit together like puzzle pieces
What tool was used to measure the seafloor?
Sonar
What are three types of heat transfer?
Conduction, Convection, and Radiation
Which layer is liquid?
Outer core
Which type of crust is denser?
Oceanic crust
What mountain range was made when continental crust collided into continental crust?
Himalayan Mountains
What was the first supercontinent called?
Pangea
What is the specific underwater volcanic mountain ridge he discovered called?
Mid-Atlantic Ridge
What type of heat transfer moves the tectonic plates?
Convection
Which layer is broken into plates?
The Crust
Which type of boundary occurs when plates come together and collide?
Convergent
What type of boundary created the East African Rift Valley?
Divergent
Why wasn't his theory accepted?
He couldn't explain what moved continents or tectonic plates
Does the rock get older or younger as you move away from the mid-oceanic ridge?
Older
What is denser, rock or magma?
Rock
Which layer do the plates float on?
Mantle
What type of boundary occurs when plates pull apart?
Divergent
What is a real world example of a Transform Boundary?
San Andreas Fault
Name key pieces of evidence that supported his idea of continental drift?
1. Similar fossils found on different continents
2. Similar rock found at the same depths underground on different continents
What kind of plate boundary is causing the seafloor to spread apart?
Divergent Boundaries
Where are earthquakes and volcanoes found?
Along tectonic plate boundaries
What is the main cause of the movement of tectonics plates?
Convection currents in the mantle
How do transform boundaries get their name?
Transform boundaries only change or transform the crust, they don't create new crust or destroy old crust
What are the two main features that are formed when oceanic crust converges or subducts with under continental crust?
Volcanoes and Trenches