Download Guided Notes for Continental Drift and Sea Floor Spreading

Name: _______________________________________
Period: ______
Guided Notes on Sea Floor Spreading
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___________________________ hypothesized that at one time all of the
___________________________ were joined together in a single landmass he
named ___________________________ and have since drifted apart. This is now
known as ___________________________.
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Wegener gathered the following evidence to support his hypothesis.
1. Evidence from ____________ _________________ such as
____________________ __________________ lining up on
___________________ when pieced together.
2. Evidence from _____________________ or traces of ancient organisms
preserved in rock show the same ___________________ and
____________________ occurred on the now separated land masses.
3. Evidence from __________________ ___________________ where Wegener
showed scratches on rocks made from ________________________ in places
with much more mild climates today.
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____________________________ could not provide a satisfactory explanation for
the ______________ or _____________ of the continents, therefore his hypothesis
was rejected until ____________________ _____________________ proposed a
radical idea suggesting a process of __________ _______________
_____________________.
YMS 7th Grade Science 2014-2015
Binder Section: NOTES
Name: _______________________________________
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Period: ______
__________ _________________ ____________________ - The sea spreads apart
along both sides of a ___________ ___________________ ____________________
as new crust is added. Ocean floors move like a _________________________
_______________, carrying continents along with them.
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Evidence of Hess’s theory of sea floor spreading included:
1. Evidence from ____________________ _____________________ which
looked like pillow-shaped rocks formed of molten material
_____________________ and ___________________ quickly.
2. Evidence from ____________________ _____________________ - rocks that
lie in a pattern showing a record of ______________________ of the Earth’s
_________________________ ____________________.
3. Evidence from ____________________ ____________________ reveal that
the farther from a ____________________ the rocks were taken from, the
__________________ they were.
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Eventually the ocean floor sinks into deep underwater canyons called
________________ ___________________ ___________________ where
_____________________ takes place which allows part of the ocean floor to sink
back into the ________________________ over tens of millions of years.
YMS 7th Grade Science 2014-2015
Binder Section: NOTES