Geologic Time
What is the geological time scale?
The division of Earth's history.
What is the compositional layer deepest from the surface?
Inner Core
What boundary causes earthquakes?
Transform boundaries
How do we measure the power of an earthquake?
Seismic waves from earthquakes
What are the three types of rocks?
-Igneous
-Sedimentary
-Metamorphic
How old is the earth?
Approximately 4.54 billion years old.
What is the difference between the compositional and mechanical layers of the earth?
Compositional layers: chemical makeup
Mechanical layers: physical properties
Who first hypothesisized Continental Drift?
Alfred Wegener
What is the scale used to measure an earthquakes power?
The Richer Scale
What is a mineral?
A naturally-occurring solid with crystalline a structure
List the four major geologic subdivisions in order from longest to shortest
-Eon
-Era
-Period
-Epoch
What are the mechanical layers of the earth?
Lithosphere
Asthenosphere
What is the difference between Divergent Boundaries and Convergent Boundaries?
Divergent Boundaries come apart
Convergent Boundaries come together
What are the 4 types of Volcanos?
-Composite
-Cinder
-Shield
-Super Volcano
What is erosion?
The process where the land is worn away by natural forces
How long did the Precambrian Time last?
About 3 billion years.
What are the compositional layers of the earth?
Crust
Mantle
Inner core
Outer core
What three peices of evidence led to the continental drift theory?
Rock formation, fossil evidence, and continent shapes
Plumes
What is the rock cycle?
The continuous process of rocks changing from one type to another through geological forces like heat, pressure, and weathering
How are Eras Divided?
Major changes is fossils
What are the differences between the inner and outer core?
Inner core: Solid ball of iron and nickel
Outer core: Liquid metal
Why was Alfred Wegener's hypothesis of continental drift not taken seriously by most geologists?
He couldn't explain how the continents would move through the solid ocean crust
What is the most dangerous part of a volcanic eruption?
Volcanic ash
What is deposition?
the process where sediments are laid down and accumulate in layers