Stickmen's Guide to Mountains and Valleys in Layers

Stickmen's Guide to Mountains and Valleys in Layers — page 3
Mountains and Valleys Earth the Sun and other planets in our solar system formed nearly 4 6 billion years ago Gases and dust in space coided forming clumps that enlarged as their gravity attracted more material On the ciump that became Earth a cooling crust cracked into huge pieces clied tectonic plates which cover hotter iayers and a hardened core Mountaintops Where winters are very cold snow and ice reach far down the mountains In warm parts of the world snow and ice give way to alpine trees and plants Plains Down on the plains vast grasslands stretch out in both cool and hot climates Here wild animals roam and farmers herd cattle and grow grains 9 am S LT Under the Crust Below the plains rivers cut deep down into the rock Even deeper Earth shakes and hot volcanic magma pushes up through the crust Earth's Core At the center of Earth a soft searing hot outer core wraps around the hard inner core Both parts of the core are made mostly of metal