In this Grade 6 Earth Science lesson from Chapter 6: Plate Tectonics, students learn how Alfred Wegener developed the continental drift hypothesis and how evidence from fossils, ancient climate records, and sea floor observations supports the idea that continents were once joined in a single landmass called Pangaea. Students also explore how scientists used concepts like mid-ocean ridges and convection currents to build the theory of plate tectonics.
Section 1
Wegener Proposes Continents Drift Apart
Alfred Wegener suggested that continents were once joined in a giant landmass called Pangaea and slowly drifted apart. He used evidence from matching fossils, ancient climates, and similar rocks found on different continents.
Section 2
Scientists Gather Sea-Floor Evidence to Prove Plate Movement
Researchers found mid-ocean ridges, young rocks near ridges, and deep sea trenches, showing that new ocean crust forms and spreads away from ridges as old crust sinks at trenches, helping prove tectonic plates move.
Section 3
Geologists Combine Clues to Develop Plate Tectonics Theory
By studying tectonic plates, the sea floor, and the asthenosphere, scientists created the theory of plate tectonics. This theory explains how Earth’s plates move and why earthquakes, volcanoes, and mountain ranges form along plate boundaries.
Section 4
Convection Currents Carry Tectonic Plates Across Earth
Hot rock in the mantle rises, cools, and sinks in a cycle called convection currents. These currents, along with forces like slab pull and ridge push, help move Earth’s huge tectonic plates over millions of years.
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Section 1
Wegener Proposes Continents Drift Apart
Alfred Wegener suggested that continents were once joined in a giant landmass called Pangaea and slowly drifted apart. He used evidence from matching fossils, ancient climates, and similar rocks found on different continents.
Section 2
Scientists Gather Sea-Floor Evidence to Prove Plate Movement
Researchers found mid-ocean ridges, young rocks near ridges, and deep sea trenches, showing that new ocean crust forms and spreads away from ridges as old crust sinks at trenches, helping prove tectonic plates move.
Section 3
Geologists Combine Clues to Develop Plate Tectonics Theory
By studying tectonic plates, the sea floor, and the asthenosphere, scientists created the theory of plate tectonics. This theory explains how Earth’s plates move and why earthquakes, volcanoes, and mountain ranges form along plate boundaries.
Section 4
Convection Currents Carry Tectonic Plates Across Earth
Hot rock in the mantle rises, cools, and sinks in a cycle called convection currents. These currents, along with forces like slab pull and ridge push, help move Earth’s huge tectonic plates over millions of years.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter