Mechanisms of Tectonic Plate Movement, 8th grade study island

Which of the following is true about convection in Earth's mantle and tectonic plate motion? A. Plate motion and mantle convection do not relate to each other in any way. B. Evidence suggests that plate motion and mantle convection are related processes. C. Evidence suggests that mantle convection stops plate motion from occurring. D. Plate motion and mantle convection are related processes, but they cannot occur at the same time.

B. Evidence suggests that plate motion and mantle convection are related processes.

Which of the following is true about tectonic plate motion? A. Tectonic plates move in directions that are opposite the directions of underlying mantle convection currents. B. Tectonic plates move in directions that closely match the directions of underlying mantle convection currents. C. Tectonic plate motion is not related in any way to mantle convection currents. D. All tectonic plates move in the same direction and at the same rate.

B. Tectonic plates move in directions that closely match the directions of underlying mantle convection currents.

The image below is a cross section through the Earth's interior. Tectonic plates of the lithosphere are shown in grey at the Earth's surface. The Earth's mantle is shown in red-orange. Black arrows in the lithosphere show the directions in which tectonic plates move. Red arrows in the mantle represent convection currents. Image from http://pubs.usgs.gov/gip/dynamic/graphics/Fig32.gif The part of the diagram labeled as "Ridge" represents a mid-ocean ridge, where two tectonic plates move away from each other. The part of the diagram labeled as "Trench" marks an ocean trench, a location beneath which one plate plunges under another.According to this diagram, where is a mantle convection current most likely to move upward? A. in the Earth's atmosphere B. beneath a mid-ocean ridge C. in the Earth's inner core D. beneath an ocean trench

B. beneath a mid-ocean ridge

To which of the following is convection of the Earth's mantle most directly related? A. ocean waves B. tectonic plate motion C. composition of the Earth's core D. erosion of the Earth's crust

B. tectonic plate motion

The image below models the activity that occurs between two tectonic plates What does the model demonstrate? A. Convection currents in the asthenosphere keep each plate in one place so that they do not collide. B. Each plate is pulled straight downward due to the convection currents in the asthenosphere. C. Convection currents in the asthenosphere contribute to the force pushing plates toward each other. D. Each plate is rapidly expanding due to the convection currents in the asthenosphere.

C. Convection currents in the asthenosphere contribute to the force pushing plates toward each other.

Image modified from http://pubs.usgs.gov/gip/dynamic/slabs.html The map above shows the boundary between the South American plate and the African plate. The red arrow on each plate shows which direction the plate is moving relative to the other plate.Which kind of tectonic plate boundary is this? A. subduction zone B. convergent boundary C. divergent boundary D. transform boundary

C. divergent boundary

The decay of radioactive isotopes is a source of internal energy for the Earth because _______ is produced as a byproduct of the decay process. A. sound B. light C. heat D. force

C. heat

Which of the following provides the most evidence for the theory of plate tectonics? A. the coloring of the city moths B. the locations of the glaciers C. the spreading of the sea floor D. the changing of the seasons

C. the spreading of the sea floor

How might two lithospheric plates interact with each other? I.They can collide with each other.II.One plate may slide under another plate.III.They can slide past each other. A. I and III only B. I only C. I and II only D. I, II, and III

D. I, II, and III