5th Grade-Ch. 9 Lesson 2 What causes earthquakes and volcanoesPresentation Transcript
Ch. 9 Lesson 2 What causes earthquakes & volcanoes?
section of lithosphere
move b/c of gravity & convection currents
Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle to move. It moves in a pattern called a convection current that forms when warm material rises, cools, and eventually sinks down. As the cooled material sinks down, it is warmed and rises again.