Evidence of Plate Motion
The name referring to the supposed "supercontinent" that existed years ago
What is Pangaea?
Oceanic and continental
What are the two types of crust?
Tension, compression, and shearing
Divergent and convergent plate boundaries
(what happens here?)
(How do volcanoes form differently at these boundaries?)
What is subduction?
Cold dense rock sinks to the bottom, while hot rock rises to the surface
Explain convection currents
A break in the rock of Earth's crust or mantle, usually occuring at plate boundaries
What is a fault?
(List and describe the three types)
An area where lava frequently erupts at the surface, independent of plate boundary processes
What is a hot spot?
Mountain ranges line up on different continents and fossils from plants from one region are found on other continents
(What hypothesis do these support?)
What evidence support the hypothesis of continental drift?
Divergent, transform, and convergent
What are the types of plate boundaries?
(Describe each of them)
When a plate boundary releases stress that has been building up for many years, and causes shaking and trembling.
How do earthquakes and tsunamis happen?
Lava with low silica will cause a _____________ eruption
Lava with high silica will cause a _____________
eruption
Quiet and Explosive eruptions
Zipper like chains of undersea mountains
What is a Mid-Ocean Ridge?
A region in the Pacific Ocean that is prone to volcanic activity and earthquakes
What is the ring of fire?
_________ are folds in rock that bends upwards
_________ are folds in rock that bend downwards
Anticline and synclines
(How does relate to the formation of mountain and valleys?)
Monitor gas levels, measure maga levels with tiltmeters, and use telecommunications
How can scientists predict volcanos?
When molten lava flows up through cracks of the Earth's surface and hardens into new rock, causing the entire floor of the plate tectonics to move away
Explain sea-floor spreading
An idea supported by a lot of evidence
A number that geologists use to assign to an earthquake based on its size
What is magnitude?
(Describe the increase of seismic waves, and energy released)
An empty volcano falls into itself, creating a crater where water can fill