Continental Drift
Who created the theory of Continental Drift?
Alfred Wegener
What layer of the Earth makes up the tectonic plates?
The crust
What type of Plate boundary gives us earthquakes
Transform Boundaries
What do we call molten rock on the surface of the Earth
Lava
This is the machine used to measure earthquakes.
Seismograph
What was the supercontinent called 350 million years ago?
Pangea
What is the theory that the plate move called?
Plate Tectonics
Mid-ocean ridges are common in what boundary?
Divergent Boundaries
The Hawaiian islands are made up of these types of volcanoes that are very broad and have a gentle slope.
Shield Volcanoes
This is the point at which an earthquake starts.
Focus (Hypocenter)
Where did we find fossils of tropical plants that told that the continents had moved?
Antarctica
What is the cycle of Warmer magma rising and cooler magma sinking in the mantle called?
Convection current
When 2 continent plates collide with each other, the result is what?
Mountain formation
High silica Lava results in what kind of eruption?
Explosive Eruptions
What is the highest rating an earthquake can have on the Richter Scale?
10
Are the continents still moving?
Yes.
What process involves magma rising from the mantle, new crust forming in the ocean, and the older crust being pushed away on either side of a ridge?
Seafloor spreading
Strong Earthquakes are a hazard of what?
Transform Boundaries
What is the most dangerous part of a volcanic eruption?
Pyroclastic Flow
What scale measures how powerful (magnitude) an earthquake was?
Richter scale
Why was Alfred Wegener's theory not accepted?
He had no way to explain how the the plates moved
What evidence do scientists use to show that seafloor spreading is occuring?
Age of rocks or Magnetic Stripes
What direction does a convergent boundary move?
-> <-
This volcano type is the largest and is the same type that Mt. St. Helens was.
Composite (stratovolcano)
What Scale measures how much damage to humans an earthquake created?
Mercalli Scale