Sea Floor Spreading Reading

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Sea floor spreading reading.

This is a 50 000 mile chain of volcanic mountains in the middle of the ocean. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor. Since the lesson itself is pretty ambitious in terms of what students are tasked to do it necessitates at least two periods i have around 60 minutes period of task time in order for students to complete everything. Hess believed that sea floor spreading is the answer to the mystery of continental drift.

Continental drift sea floor spreading pdf or google doc pg. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american. Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them. Once students learn about the mid ocean ridge drifting continents and how the earth moves from the reading they can put their knowledge to the test with a works.

This sea floor spreading reading and worksheet gives your students a 2 page reading which is easy to comprehend and full of information. In the mid 1900s scientists mapped the mid ocean ridges using sonar. Sea floor spreading the longest chain of mountains in the world is the system of mid ocean ridges. Most basalt magmas contain abundant molten iron.

586 7 10 13 15 16 guided reading. Once the basalt cools completely into solid rock the. 3 the mid ocean ridge is found throughout the oceans of the earth. Earlier theories by alfred wegener and alexander du toit of continental drift postulated that.

Sonar is a device that bounces sound waves off underwater objects and then records the echoes of these sound waves. Layers of the earth pdf or google doc guided reading. This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century. Their crystals are pulled into alignment by the earth s magnetic field just like a compass needle is pulled towards magnetic north.

Seafloor spreading is a process that occurs at mid ocean ridges where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.