“A slide deck for direct instruction on Use the slides to complete each sentence. Write the missing word or phrase on the blank line. 1. Alfred Wegener is known as the “Father of ____________.” 2. Wegener proposed that all the continents were once joined together in one supercontinent called ____________. 3. The idea that Pangaea split and the continents moved to new positions is called the ____________ ____________ Theory 4. The theory of plate tectonics says pieces of Earth’s ____________ are in slow, constant motion driven by ____________ currents in the mantle. 5. The seven major tectonic plates include the ____________, ____________, __________, __________, ________, __________-, and ____________ plates. 6. Plate movements are most obvious at the ____________ between plates. 7. The three main types of plate boundaries are ____________, ____________, and ____________. 8. A ____________ boundary is where plates move toward each other and often causes earthquakes, volcanoes, and mountains. 9. The region around the Pacific Ocean with many earthquakes and volcanoes is called the ____________ of ____________. 10. A ____________ is the shaking that results from movement of rock along a ____________ (a break in the crust). 11. A ____________ forms when magma pushes up through Earth’s surface; molten rock beneath the surface is called ____________. 12. When two continental plates collide, they usually form ____________ (example: the ____________ Mountains). 13. When two oceanic plates converge, one may subduct and form a deep underwater canyon called a ____________ and a chain of volcanic islands called an ____________ ____________. 14. The deepest trench on Earth, over 36,000 feet deep, is the ____________ ____________. 15. Subduction is the process by which ____________ crust sinks beneath a ____________ plate and returns to the ____________. 16. A ____________ boundary is where plates move away from each other, producing features like rift valleys and the ____________ ____________. 17. Sea-floor ____________ occurs when new oceanic crust forms at a mid-ocean ridge and pushes older crust away. 18. A ____________ boundary is where plates slide past one another, producing shearing and earthquakes (example: the ____________ ____________ Fault). 19. Match these definitions with the correct term (write the letter on the blank): a. The shaking from movement along a fault — ________ b. Process where oceanic crust sinks back into the mantle — ________ c. Boundary where plates move apart — ________ d. Deep ocean canyon from converging plates — ________ e. Boundary where plates move toward each other — ________ f. Undersea mountain chain where new ocean floor is made — ________ g. Boundary where plates slide past — ________ h. Mountain formed when magma erupts — ________ i. Break in the crust where rocks move — ________ j. Theory that Earth’s surface is divided into moving plates — ________ Terms: Earthquake; Subduction; Divergent Boundary; Oceanic Trench; Convergent Boundary; Mid-Ocean Ridge; Transform Boundary; Volcano; Fault; Plate Tectonics 20. Short answer — complete the sentence: The Mid-Ocean Ridge is the longest mountain chain on Earth (about ____________ miles long) and most of it lies ____________. 21. Quick check (circle the correct word): o The outer core is (solid / liquid). o Divergent boundaries make (trenches / mid-ocean ridges). o Transform boundaries cause mainly (volcanoes / earthquakes). 22. Extension (one sentence): Explain how convection currents in the mantle drive plate motion.”