Ocean tides and Natural Disasters B. They are the upper part of the crust b. Human's running C. Convection currents D. Rock cycle Earthquakes and volcanoes can reveal a lot about plate boundaries. These plates move about the Earth, just inches each year. ... (1800 mile-) thick mantle—in which warm, buoyant rock rises and cooler, denser material sinks—is the underlying driving force for plate movement. a. Ocean tides b. Volcanic eruptions c. The rock cycle d. Convection currents 7. This module looks at the nature of tectonic plates and discusses the different boundary types that exist between them – convergent, divergent, and transform. The weakness of the asthenosphere allows the tectonic plates to move easily towards a subduction zone. Want to read the whole page? And for newly subducting slabs, the resisting force of the mantle as the slab tries to force its way through is stronger than the shearing on the top and bottom of the descending slab. In this session, we investigate how these phenomena are connected to the movement of plates. Heat from Earth's core could be underlying force in plate tectonics. These slight movements are responsible, in great part, for … Earlier theories (that still have some supporters) propose gradual shrinking (contraction) or gradual expansion of the globe. • Mantle convection and plate tectonics are part of the same system. by Greg Borzo, ... Convection, or the flow of mantle material transporting heat, drives plate tectonics. Both provide dramatic evidence of plate tectonics in the form of volcanoes and earthquakes. When a plate breaks along what are called faults, there is a release of energy, which causes seismic waves (the ground shaking). Convection currents are powered by what? What is the underlying force that drives plate tectonics? What is the underlying force that drives plate tectonics? The correct answer is plate tectonics. Forces That Drive Plate Motion. a. Forces that drive the push and … ANSWER: You've reached the end of your free preview. The main features of plate tectonics are: The Earth's surface is covered by a series of crustal plates. Which of the following is true of Earth's landmasses? The greater density of old lithosphere relative to the underlying asthenosphere allows it to sink into the deep mantle at subduction zones, providing most of the driving force for plate movement. This prediction of plate tectonics is also referred to as the conveyor belt principle. resisting forces The main effect of the underlying mantle is to produce a shearing or frictional force resisting the motion of lithospheric plates. Tectonic plates are able to move because the Earth’s lithosphere has greater strength than the underlying asthenosphere. Tectonic evidence for plate tectonics indicates independent plate motion or rotation, or else describes large-scale geological features that were created by dominantly horizontal tectonic forces. A. Convection currents beneath the plates move the crustal plates in different directions. The outermost shell of Earth, called the lithosphere, is partitioned into different tectonic plates (7 or 8 major ones). As we examine what happens at and between plate boundaries, our focus shifts to the mechanisms deep within the Earth that drive what we observe at its surface. As envisioned in … The ocean floors are continually moving, spreading from the center, sinking at the edges, and being regenerated. ANSWER: 5. What is the underlying force that drives plate tectonics? They are made of a single tectonic plate c. … According to the theory plate tectonics, the Earth's crust is broken into about 12 plates that float on hotter, softer rocks in the underlying mantle.
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