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Lesson 2: “Seafloor Spreading” 1. During World War I, scientists used underwater ________________ to detect the varying depths of the ocean. This is known as “sonar” today. 2. While using this method of echo location, they discovered an underwater system of ____________________ (mountains) and ____________________. 3. In the Atlantic, Pacific, and other oceans around the world are a system of ridges called “______________________” ridges. 4. In some of these ridges are long rift valleys where _____________________ and _______________________ occur from time to time. 6. Seafloor spreading occurs when the seafloor spreads apart and hot _____________ seeps up to the crust where it _____________, _________________ and forms a new ________________________. Underwater volcanoes are found here. 7. This colder and denser seafloor ___________ and continues to form ridges. 8. There are two things that provide evidence/proof of seafloor spreading: a) ______________________: _________________ rock is found near the mid-ocean ridges and the ___________ rock is farther away. b) ______________________: The magma that is forced upward generates ______________ that supports these exotic life forms to thrive in the cold, deep ocean. *In the box below draw an illustration of seafloor spreading. Be sure to label the following: rift zone, old rock, & younger rock, subduction zone, magma) Lesson 2: “Seafloor Spreading” (B) 1. During World War I, scientists used underwater (soundwaves/ cameras?) to detect the varying depths of the ocean. This is known as “sonar” today. 2. While using this method of echo location, they discovered an underwater system of _________________ (mountains) and ____________________. 3. In the Atlantic, Pacific, and other oceans around the world are a system of ridges called (ocean valley/ mid-ocean?) ridges. 4. In some of these ridges are long rift valleys where _____________________ and _______________________ occur from time to time. 6. Seafloor spreading occurs when the seafloor spreads apart and hot (rocks /magma?) seeps up to the crust where it cools, solidifies, and forms new (seafloor/ mountain ranges?). Underwater volcanoes are found here. 7. This colder and denser seafloor (rises/ sinks?) and continues to form ridges. 8. There are two things that provide evidence/proof of seafloor spreading: a) THE AGE OF THE ROCKS: _________________ rock is found near the mid-ocean ridges and the ___________ rock is farther away. b) EXOTIC LIFE FORMS: The magma that is forced upward generates ______________ that supports these exotic life forms to thrive in the cold, deep ocean. **In the box below draw an illustration of seafloor spreading. Be sure to label the following: rift zone, old rock, & younger rock, subduction zone, magma)