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Changing Earth

QuestionAnswer
The supercontinent landmass that scientists believe covered the earth about 250 million years ago. Pangaea
The movements of the Earth’s crust, which is divided into 12 giant pieces. Plate Tectonics
These are created when magma from the mantle heats up + rises, then cools + sinks. Convection Currents
The process when magma from the mantle rises through cracks on the ocean floor and a new underwater mid ocean ridge is formed. Sea-floor Spreading
A place where two plates meet is called a plate boundary. Name two things that can happen when plates move. Earthquake, Volcano, Mountains, Continental drift
What was Alfred Wegener’s theory called? Theory of Continental Drift
How many continents did Pangaea eventually split into? (AKA How many do we have today?) Seven (7)
Hypothesize what the Earth will look like in another 250 million years if Continental Drift is still happening. Continents will eventually collide into a new giant landmass again
List 3 pieces of evidence that support Wegener’s theory? Fossil bands, Rock/Mountain Formations, and Climate conditions on different continents, coal beds, coastline match up
The three types of plate boundaries. Convergent, Divergent, Transform
This type of plate boundary occurs when two plates collide. Convergent
This type of plate boundary occurs when two plates slide horizontally by one another, causing rocks to break and can cause earthquakes. Transform
Mantle convection can cause plates to move apart. What kind of boundary is this? Divergent
List two types of events that could occur at a CONVERGENT boundary. Mountain formation, Subduction zone (volcano, trench)
Name the three types of rock. Sedimentary, Metamorphic, Igneous
How does sediment form? Weathering and Erosion
How does igneous rock form? Cooling Magma
How does metamorphic rock form? Heat and Pressure
How does Sedimentary Rock form? Compaction and Cementation
Weathering is the….. Breaking down of rock into smaller pieces.
Erosion is the…. Movement of Sediment
Deposition is the… Settling of Sediment
Give an example of weathering. What causes rocks to break down? Ice wedging, Plants, Animals, Wind, Water, Snow, Human force
What type of plate boundary has plates that move towards each other? Convergent
What type of boundary has plates moving away? Divergent
What type of boundary has plates sliding against each other? Transform
What is the ring of volcanoes and earthquake activity around the Pacific Ocean? Ring of Fire
What is is created when one plate sinks below another? Subduction Zone
Created by: LCarnell
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