Radiometric dating indicates that planets formed 46 billion years ago What are

Radiometric dating indicates that planets formed 46

This preview shows page 1 out of 1 page.

When did the planets form? Radiometric dating indicates that planets formed 4.6 billion years ago What are terrestrial planets like on the inside? Core, mantle, crust structure Denser material is found deeper inside What processes shape planetary surfaces? Cratering, volcanism, tectonics, erosion What determines a world’s level of geological activity? Interior heat drives geological activity Big planets cool off slower than small ones Radioactive decay is currently main heat source How does a planet’s surface reveal its geological age? Amount of cratering tells us how old the surface is What geological processes shaped our Moon? Early cratering still present Maria resulted from volcanism What geological processes shaped Mercury? Cratering and volcanism similar to Moon Tectonic features indicate early shrinkage What are the major geological features of Venus? Venus has few craters - young surface Dominated by volcanism Also has tectonics but little or no erosion What are the major geological features of Mars? Differences in cratering across surface Giant shield volcanoes Evidence of tectonic activity What geological evidence tells us that water once flowed on Mars? Features that look like dry riverbeds
Image of page 1

You've reached the end of your free preview.

Want to read the whole page?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture