Chapter 7.1 Digital Lesson Flashcards
What happened to the temperatures around the world because of the gas and ash in the atmosphere because of a volcano
Temperatures around the world dropped
What was wegners hypothesis about continental drift
He thought the continents drifted to their current location
Who thought the continents looked like they could fit together like a puzzle piece
Ortelius
What did Wegener call the supercontinent
Pangea
4 pieces of evidence for continental drift
- Matching coastlines
- Similar rock layers
- Similar past climates on different continents
- Similar fossils on different continents
Convection currents
Circular pattern in the asthenosphere that are caused by heat and density differences
What are tectonic plates giant slabs of
Lithosphere
What is caused by the scraping of plates
Earthquakes
What is caused by the pushing of plates into each other
Crumbling of earths surface forming mountains and large earthquakes
What forms when the plates move apart
Molten rock rises and cools forming new rock
When scientists discovered the sea floor to be thin what did it suggest about its age
The sea floor was younger then what it was thought to be
When did the volcano on the island krakatau erupt
August 27, 1883
What causes mid ocean ridges
Volcanic eruptions
What causes stripes on the sea floor
Made by magnetic reversals which is when earth’s magnetic field changes orientation at random times
Why is the earth not expanding when it’s ocean basins continue to widen during sea floor spreading
Some plate is destroyed at subduction zones
What are the two player movements that can cause volcanoes
When two plates pull apart or when one plate sinks beneath another plate
How does the knowledge of tectonic plates impact society(4)
- Gain scientific knowledge
- Prepare for eruptions
- Build earthquake resistant structures
- Help find resources
True of false: the observation of matching coastlines was some of the earliest evidence that contributed to the development of the theory of plate tectonics
True
Continental drift contributed to the development of
The theory of plate tectonics
Where does sea floor spreading occur
Mid ocean ridges
Three processes that scientists think might cause tectonic plate motion
Continental drift, sea floor spreading, earthquakes and volcanoes
