The ground beneath your feet feels completely still... but the continents are actually moving all the time.

In this episode of Why Though?, Dr Matt Agnew explains why continents drift across the Earth, how tectonic plates slowly carry them around the planet, and how that movement creates mountains, deep ocean trenches and earthquakes.

What you'll discover:

• Continents move just a few centimetres each year... about as fast as your fingernails grow
• Long ago, every continent was joined together in one giant supercontinent called Pangaea
• Earth's crust is made of enormous tectonic plates rather than one solid shell
• When plates collide they can push up mountain ranges like the Himalayas
• When one plate slides underneath another, it creates deep ocean trenches through a process called subduction
• Earthquakes happen when pressure builds between stuck plates before suddenly being released

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