HS-ESS2-7

Construct an argument based on evidence about the simultaneous coevolution of Earth systems and life on Earth.

  1. Earth

    When life exploded

    Life exploded in diversity during the Cambrian Period. Experts are exploring what could account for this sudden change 540 million years ago.

    By Beth Geiger
  2. Earth

    How people have been shaping the Earth

    We are the dominant force of change on Earth. Some experts propose naming our current time period the ‘Anthropocene’ to reflect our impact.

    By Alison Pearce Stevens
  3. Climate

    Germy weather

    Bacteria high in the sky could be causing rain, snow and hail.

    By Stephen Ornes