Unit 3 vocabulary Practice Quiz

definitions 1. Means “all land”, the name of the supercontinent. 2. The fern-like fossil used as evidence for continental drift. 3. The scientist to first notice that the continents were probably joined at one time. 4. The reptile fossil that is used as evidence for continental drift.

definitions 5. The hypothesis first proposed by Wegener that continents have slowly moved to their current locations. 6. Theory by Harry Hess where hot, less dense material below the crust rises toward the surface at the mid-ocean ridges. 7. The theory that combined continental drift and seafloor spreading.

definitions 8. The boundary where two plates move apart. 9. Plates slide past each other causing earthquakes at this boundary type. 10. The boundary where two plates come together.

definitions 11. The cycle of heating, rising, cooling and sinking that occurs in the mantle. 12. Plastic-like layer of the Earth below the lithosphere, contains convection currents. 13. A more dense plate (oceanic) sinks below a less dense plate (continental or oceanic) causing a trench and volcanoes at these “zones”.

Continental drift evidence 14. Give 2 examples of ROCK clues. 15. Give 2 examples of CLIMATE clues. 16. Give 2 examples of FOSSIL clues.

Changes in earth’s surface over time 17. Briefly describe how the Earth’ s surface has changed over time. (At least 5 sentences.)

Key Pangea Glossopteris Wegener Mesosaurus Continental Drift Seafloor Spreading Plate Tectonics Divergent Transform Convergent Convection Currents Asthenosphere Subduction Zone Mountain Ranges lining up, coastline depths matching, rock sequences being the same, glacial scrapings Glossopteris being found in a cold climate, glacial scrapings being found in a warm climate Mesosaurus (freshwater), Lystrosaurus (land reptile), Cynognathus (land reptile) all found on opposite sides of the ocean. The surface of Earth has changed drastically over 3.3 billion years! In its early stages, the Earth was primarily covered in water. More and more land began to appear and created multiple supercontinents, including the well- known ‘Pangea” around 250 mya and “Gondawana”. Gondawana was positioned toward the south pole and was before Pangea. After Pangea, land slowly spread apart to make the continents we know today!