Grade 10 2025-2026_Seafloor and Convection

1. 1. The process in which a denser plate is pushed beneath a less dense plate

• a) Divergent Boundary

• b) Trenches

• c) Lithosphere

• d) Subduction

• e) Tectonic plate

2. Massive pieces of land that are part of Earth's crust and upper mantle

• a) Lithosphere

• b) Trenches

• c) Divergent Boundaries

• d) Tectonic Plates

• e) Subduction

3. 3. Which of the following supports the theory of seafloor spreading?

• 
  Correlation of rock layers

• Crustal Age

• Magnetic Reversal

• Continuous Mountain Chains

4. 4. What is seafloor spreading

• a)Mid-ocean ridges continually add new material to the ocean floor

• b)When continents push together

• c)When a plate in the ocean moves down into the lithosphere

• d) Rift

5. 5. The farther from a mid-ocean ridge a rock sample is taken, the _______ the rock is

6. 6. Examining rocks that form on either side of the Mid-Atlantic Ridge provides evidence that supports the theory of Plate Tectonics. These rocks provide evidence of plate movement because, as we look at rocks farther and farther from the ridge, the rocks

• a) become thicker and thicker

• b) have higher iron content

• c) are made up of smaller particles

• d) are consistently older

7. 7. What 3 kinds of evidence were used to prove that the seafloor spread?

• 
  a. Rock formations, age of rocks, WWII shipwrecks

• b. Age of rocks, magnetic seafloor stripes, WWII ship logs

• c. Rock formations, magnetic seafloor stripes, age of rocks

8. 8. According to the hypothesis of seafloor spreading, molten rock is rising up along the (a)

• Mid-Ocean Ridge

• Deep-Sea Trench

9. 9. Seafloor spread occurs because....

• a) Plates are smashing together and oozing apart

• b) The Earth's magnetic poles are reversing

• c) Magma below the Earth's crust is forced up toward the surface after plates move apart

• d) Maui is trying to break out of his prison

10. 10. Sea-floor spreading explains how.....

• a) volcanoes are formed on continents

• b) deep sea trenches are formed

• c) new crust is created at a divergent boundary