Plate tectonics
How many years ago was Earth formed?
4.6 billion years ago
S-waves do not travel through what?
Fluids
is the mid-ocean ridge the longest or shortest chain underwater mountain?
Longest
What is the theory where they think that all of the continents have once been connected?
Pangaea
Oceanic crust and continental crust are examples of what?
Crust types
What is the outermost layer of the earth called?
The crust
What is the area called that S-waves cannot travel through?
shadow zones
What is 3 examples of sea-floor spreading?
Molten material, Magnetic stripes, and drilling samples.
how long ago did Pangaea exist?
300 million years ago
What are 3 examples of formations that plate movement forms?
The outer core of Earth is __% of sulfur?
10%
The recording of S-waves is evidence the earth is solid or liquid.
Solid
Where are volcanoes found along the sea-floor spreading?
Abyssal plains
Who made the continental drift theory?
Alfred Wegener
When plates move apart forming a rift valley is what plate boundary?
Divergent.
The inner core is solid, liquid, or gas iron?
Solid iron
The earth has a molten, fluid, __ core.
Outer core
Who created the sea floor spreading theory?
Harry Huss
What are 3 examples of continental drift?
Fossils, Land features, and climate
what are the 3 types of convergent boundaries?
Oceanic vs Oceanic, Oceanic vs Continental, Continental Vs Continental
Mantle is made up of what?
Iron, magnesium, aluminum, silicon, and oxygen
Earths magnetic field is responsible for what?
Deflecting Solar winds
What is it called when the ocean floor recycles because of gravity pulling down oceanic crust?
Subduction
Why was Wegener's hypothesis rejected.
He did not provide an explanation.
what are the weak spots around the crust where magma floes to the surface called?
Hot spots