The Earth is Cracking Up

Lesson 1 introduces the concept that the Earth is not solid, and that the crust is like a thin skin floating on top of a hot, taffy-like body of magma. This skin is cracked, and each section moves over and under other sections as well as toward and away from the other sections, all of which are movements that create mountains, valleys, island chains, volcanoes, and earthquakes.

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5mb
Keywords: 
asthenosphere, calcium carbonate, continental crust, convergent boundary, core, divergent boundary, earthquake, friction, hot spot, lithosphere, magma, mantle, ocean trench, oceanic crust, pressure, rift valley, subduction zone, tectonic plates, transform boundary