These topographic maps of the seafloor revealed that vast _____ stretched for many miles deep below the ocean's surface.
Wegener discovered ________, or deep scratches in rocks made as the glaciers moved across land.
The evidence needed was hidden on the ______ between the drifting continents.
_____ of similar organisims have been found on several continents seperated by oceans.
he proposed that all the continents were once part of a supercontinent called _____.
He studied the _____ depostied by glaciers in South America, Africa, India, and Australia.
Wegener proposed the hypothesis of ___________, which suggested that continents are in costant motion on the surface of Earth.
Scientists have discovered ______ magnetic stripes on either side of the mid-ocean ridge.
Other measurements made on the seafloor confirm ______
Basalt contains iron-rich minerals that are ______
Results show that the sediment closest to the mid-ocean ridge is _____ than the sediment farther away from the ridge.
By drilling a hole into the seafloor and measuring the temperature, scientists can measure the amount of _____ leaving Earth.
Once ocean depths were determined, scientists could create a _____ map of the seafloor.
Scientists used a _______ to measure and record that magnetic signature of these rocks.
Sometimes a ________ occurs and the magnetic field reverses direction.
Wegener suggested that, 280 million years ago, the climate of the Southern Hemisphere was much ____
The ____ beneath the continents and the seafloor is made of solid rock.
These plates are _____ on top of a hot and semi-plastic mantle.
____ buildes up where the plates are stuck and eventually, it causes the rocks to break, causing earthquakes.
When an oceanic plate and a _____ plate collide, the denser oceanic plate subducts under the edge of the continent.
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