Earth Layers
The outermost layer of the earth
Crust
Primary difference between oceanic and continental crust
Density, thickness, or the fact that continental moves
Plate boundaries that move apart
Divergent Boundaries
A kind of dating that gets an exact number for age
What is Absolute dating?
Period that the T-Rex lived in
Solid layer in the center of the earth
Inner Core
The continents were formed from an idea called ______
Continental Drift
Plate boundaries that move towards each other
Convergent Boundaries
Element used to date rocks 1,000-75,000 years old
Carbon-14
This is the earliest Eon
What is the Hadean Eon?
This core is responsible for magnetic fields
Outer core
an eon is ______ years
1 billion
Transformative Boundaries
Element used to date rocks >75,000 years old
Uranium
this Eon has the earliest evidence of life
What is the Archean Eon
The outer core stays warm with ______
Energy from the inner core
Formed by:
Dust coagulation, Pebble formation, Concentration and clumping, gravitational instability and collision based growth
What are Planetesimals?
Waves that are perpendicular to the direction of travel
What are S waves?
A type of relative dating that states lower rocks are older and younger rocks are higher
What is the law of superposition?
This eon has the first evidence of eukaryotes
what is the Proterozoic Eon?
This layer is 1802 miles deep and has a radius of 758 miles
What is the inner core
Person who created the concept of Pangaea
Who is Alfred Wegener
This type of rock can be found at plate boundaries
What are metamorphic rocks?
A geological feature that cuts through existing rocks and is younger than any of the rocks it cuts
What are cross cutting relationships?
We live in this Eon
What is the Phanerozoic Eon?