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Name: _______________________________________ Period: ______ Guided Notes on Sea Floor Spreading - ___________________________ 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 ___________________________. - 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. - ____________________________ 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: _______________________________________ - 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. - 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. - 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