• Then,seventy-million years ago, the Earth's surface, or crust,pushed upward.

    VOA: special.2010.01.04

  • "It's a horizontal motion of two pieces of the Earth's crust on either side of a vertical crack in the Earth,"

    VOA: standard.2010.01.13

  • Earthquakes generally occur when the tectonic plates that make up the Earth's crust move suddenly.

    VOA: standard.2010.01.13

$firstVoiceSent
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