Develop a model based on evidence of Earth's interior to describe the cycling of matter by thermal convection.

  1. Earth

    Ancient ocean linked to supercontinent’s breakup

    The supercontinent Pangaea started breaking apart 200 million years ago. This may have been triggered by the shrinking of the Tethys Ocean, a new study finds.

  2. Earth

    How Earth’s surface morphs

    Partly melted rock acts like grease to help huge masses of the planet’s surface slip up, around and down.

  3. Physics

    Like electricity, but magnetic

    Getting magnetic poles on the move makes a new kind of flow.

  4. Earth

    Deep drilling at sea

    Drilling holes deep into the seafloor unveils the ocean's past and hints at Earth's future.