Under the Sea
Mid-ocean ridges are an example of this type of boundary.
What is divergent plate boundary?
Another name for a quiet eruption with gently flowing lava.
What is effusive eruption?
The theory that states the continents move around on Earth’s surface and that they were once joined together as a single supercontinent.
What is continental drift?
This type of effect deals with businesses and industries.
What is economic?
This is the name of the supercontinent that existed 250 million years ago and consisted of all of the present continents?
What is Pangaea?
This is the location where new sea floor is added under the Atlantic Ocean.
What is the Mid-Atlantic Ridge?
Mount St. Helens is this type of volcano.
What is composite volcano or stratovolcano?
This German scientist is credited with developing the theory of continental drift?
Who is Alfred Wegener?
These type of effects occur after the initial eruption and have be more devastating than the initial eruption.
What is secondary effect?
Where magma is stored below Earth's surface.
What is the magma chamber?
The process by which more dense oceanic crust sinks beneath a less dense crust.
What is subduction?
Mt. Tambora spewed huge amounts of ash that rose high in the atmosphere in this type of eruption.
What is an explosive eruption?
Evidence for this theory includes pillow-shaped rocks and magnetic reversals.
What is seafloor spreading?
Ash and sulfer-rich gases can be spread through the atmosphere decreasing temperatures by blocking this from reaching Earth.
What is sunlight?
The theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.
What is the Theory of Plate Tectonics?
Using this technology, it was discovered that the ocean floor was not flat as it was previously thought to be.
What is sonar?
This is a hot mixture of rock fragments, gas, and ash that travels rapidly from a volcanic vent.
What is pyroclastic flow?
This scientist used sonar technology to map the ocean floor.
Who is Harry Hess?
The smallest fragments of volcanic rock, resembling dust or fine sand which can block out sunlight and cause cooling of the atmosphere.
What is volcanic ash?
This mineral affects the viscosity of magma.
What is silica?
A deep valley that forms at the edge of a continent when an oceanic plate sinks underneath a continental plate.
What is a trench?
These two qualities of magma affect the type of eruption.
What are silica content and viscosity?
The fossils of this small, lizard-like reptile measuring roughly 71 centimeters in length with the ability to swim in fresh water provided evidence of continental drift.
What is the Mesosaurus?
This is the term for a mudslide that occurs from the mixture of melted snow and rock fragments.
What is a lahar?
The reason why the Theory of Continental Drift was not well received by other scientists.
What is that it did not explain why or how the continents moved?